Check the exterior carefully to see if it has been disassembled or bumped, and if there are any cracks, if you find this type of problem, don't buy it no matter how cheap it is. However, if there are only some minor scratches, it can be considered, this is because due to the need for mobility, some small friction is inevitable. And buy a used laptop to look at its thickness, size, weight, and similar used laptops to compare, who to choose, according to their actual needs.
Step 2: Look closely and check your LCD display
This is very important. As we all know, the LCD display is the most expensive part of the laptop accessories, accounting for 20% to 35% of the cost of the entire machine, so you should pay special attention to when you buy: 1, the screen has no traces of damage, because there are traces of the machine for long periods of time, the refraction of the light will be serious damage to the human eyesight, accidentally move back to a machine that affects the eyesight is not worth it. 2, carefully observe the size of the display and display effect, the display effect and size of the display and price linked to consider, of course, can also be used to press the price. 3, detailed identification of the color of the display. Observe the color in addition to observing the screen is sixteen-color, 256-color or sixteen-bit true color as well as 24-bit true color, but also in its up and down, left and right diagonally across the observation, if no matter in which aspect can be accurately seen in the screen color, in order to conclude that it is true color. Otherwise, if you can only observe in front of it to identify the color, then it is pseudo-color. Can hold a high-priced high-quality LCD monitor at the merchant, and it will be placed next to the notebook you want to buy, in the same interface to compare their brightness, contrast and response speed, visibility and other parameters of the advantages and disadvantages. 4, pay attention to the delay performance and brightness of the monitor. When selecting an LCD monitor, the main thing should actually be its delay length, if the delay time is too long, the eyes will feel tired. At the same time the brightness is a weak point of the LCD display, the popularity of the LCD brightness is generally in the 200cd / ㎡ (lumens), below this brightness of the monitor is not desirable. There is also in the brightness of the time do not look at a single, with the contrast adjustment to see. Some LCD monitor brightness no matter how to adjust the same, the results of a high contrast look very harsh, extremely uncomfortable. In short, the eyes look comfortable and beautiful prevail. 5, pay attention to the bad points of the LCD screen. The most common is the white point and black point, we use the following simple method to identify when you buy: the general black point of identification is the entire screen background into a white screen, the black point is generally not escape your eyes; white point is just the opposite, the background of the screen will be adjusted to black, and this time the white point will also show its original form! However, in addition to white and black dots, sometimes there are other colored dots," which consumers can establish a red, yellow and blue screen background to simply identify.
The third step: carefully identify and test the components of the notebook
Check carefully the laptop's CPU, hard disk, memory and other components, the purchase of the best machine can be disassembled to see for themselves. In addition, we must be wary of the second-hand notebook traitors use desktop CPU to replace the laptop CPU despicable practices. Because the same CPU of the same frequency of the general user will not notice, but the use of desktop CPU and notebook CPU is very different, due to the problem of heat generation is different, so that the CPU issued by the heat in the notebook can not be dispersed, resulting in system instability. So try to ask for an on-site inspection of the CPU during the purchase process. For the hard disk, due to the inability to understand the advantages and disadvantages of the hard disk through visual observation, only through the software method to detect, detection software available DM, NORTON, etc., through the DM, NORTON scanning, DM takes longer, NORTON time-consuming shorter. The scanning process must be smooth and even speed, if which cluster area takes too long, that the cluster area must have problems. About memory, used notebook memory from 32M to 256M are available, try to choose memory greater than 64M, preferably more than 128M. Memory in the purchase of the full, because some laptop memory is more special, now long discontinued, can not be another match. In addition to the other peripherals such as graphics card sound card, should also be viewed clearly in person.
Step 4: Check the interface of the used laptop
Because it is essential to have a full range of interfaces. In today's laptop, with the popularity and application of external storage devices, USB interface has become a desktop or laptop necessary device, USB port is very important an interface. So it is best to buy a used laptop with a USB port. In addition, infrared transmission and reception is now an essential feature of the notebook. And when buying a used laptop, an important purchase condition is to look at its internal power supply. An external power supply is a must, and you can't do without a battery, so the main thing to look at is the power supply is also the battery, that is, how long the battery lasts. For second-hand goods, nickel-metal hydride batteries can generally be used for one hour within one to two years, lithium-ion batteries can be used for two hours, which is the most basic requirement, otherwise do not consider.
Step 5: Check the status of peripherals
View whether the keyboard, mouse, optical drive, floppy drive, modem, etc. are available and working well. The last time I saw a used laptop in the second-hand market, the keyboard was shiny and worn out very badly, in which case you don't have to buy it, and you'll have to pay hundreds of dollars to change the keyboard. At the same time, open a word processing software, try to see if every key on the keyboard is available, and if the mouse is flexible. Whether the built-in floppy drive, CD-ROM drive, modem, etc. are available, please try them one by one, as long as the equipment inside the computer can not be missed!
Step 6: Try to get after-sales service from second-hand vendors
This should also be the last step. Remember to retrieve all the accessories of this book (battery, power cord, etc.), the graphics card sound card communication card drivers should also be, but most of the sellers say no, the driver if there is really no does not matter, you can go to the laptop manufacturer's Web site, to download a full set of device drivers for this model of computer. Finally, a particularly important matter, second-hand laptop computers generally have two or three months of warranty (repair) period, be sure to dealers to warranty (repair) period written in the invoice, and during this period of your second-hand laptop many times for the test, and strive to find all the hidden problems, otherwise after the warranty period, you want to repair this type of computer, especially the hardware part of the failure can be troublesome, and be sure to take into account the future! Repair whether it is convenient, if you can not buy parts, the machine is in the cheap can not be, because due to the laptop internal space is small, shortage of parts, the existence of compatibility problems and other reasons laptop upgrade possibility is almost zero.
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Used laptops are "weathered" and can go on strike at any time after purchase, so how do you The most important thing is to make sure that you are getting the best value for your money when you buy a used laptop. In fact, to do this is not very difficult, as long as you do the following identification matters can be.
Cooling performance, should be the focus of attention
Laptop cooling performance directly affects the performance of the laptop, but also can test the second-hand laptop material is good. Check the heat dissipation, it is best to first power on the laptop to run for a period of time, and then feel the temperature of the laptop shell with your hand, if you feel hot, then the selected used laptop cooling effect is not good, and if it continues to run too long, the laptop may be dead.
Bad spot detection, have to do the work
Since the quality of the LCD display is directly related to the user's visual experience as well as the service life of the laptop, so carefully check the laptop display with or without bad spots is a must step to identify the laptop. Bad point is actually in the pure black background or pure white background, LCD display has been opaque or has been transparent or even a fixed color pixels are called a bad point, if the number of bad points on the display more than 5, you can not buy, because over time, the number of bad points will be more and more until the entire display can not be normal display.
Performance testing, the "top priority"
Checking for good overall performance is a way of verifying that the laptop you're currently buying is still worthwhile. Check to see if the mouse is responsive, the touchpad is bright, the program runs normally, the screen display is clear, the laptop is running noisy, and after a long period of time the laptop is often dead.
Auxiliary equipment, absolutely should not be ignored
Because most of the auxiliary equipment in the second-hand laptop computer running use for a long time, in the performance of the stability of the performance may be relatively lack of, so the use of the frequency of malfunction is very large. Once a failure occurs, it is also more difficult to repair. Because most of the auxiliary equipment in the second-hand laptop is old, and the old model in the current laptop market has been on the verge of extinction, then with the old auxiliary equipment of course, it is difficult to find; if you use other equipment to replace, may be due to the second-hand laptop compatibility can be poor, and will affect the entire laptop's performance, and even make the laptop can not continue to work! The laptop may even be unable to continue to work due to poor compatibility. Therefore, the user must check one by one whether the auxiliary equipment like keyboard, floppy drive, optical drive is intact.
Complete accessories, is the minimum "threshold"
Accessories in the Simplified Chinese user manual can guide you how to use the laptop correctly, especially in the attached driver disk and system recovery CD-ROM and so on, must not be less, otherwise the system in the reinstallation of the system after a number of devices can not be correctly driven!
Power supply specifications, can not wait to see
Now a lot of second-hand laptop computers are foreign brands, for example, many Japanese second-hand laptop computer power supply specifications for the 110V, such a computer to buy back is obviously can not be used in the 220V power supply under. Therefore, users must verify the specifications of the power supply used to avoid power supply problems to bring unnecessary trouble.
Network capabilities, should also be concerned
The main use of computers now is to access the Internet, and if you buy a laptop that does not have even the most basic LAN card or built-in Modem, then we can not access the Internet.
Regular places, should be the only place
After all, there is a greater risk of buying a second-hand laptop, in order to minimize the risk, it is best to look for some of the larger specializing in second-hand laptop business merchants, they provide second-hand laptops are usually very good color, and also provide a certain amount of warranty services, in the configuration of the higher, but the price of The first thing you need to do is to get your hands on a new laptop, and you'll be able to get it for a long time.
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The rise of laptops in China has been a matter of recent years. But under the overwhelming publicity of major manufacturers, coupled with the laptop's own portability, mobility, and glare, many users are willing to buy a laptop of their favorite. But the laptop but the price is expensive, rich users of course is to buy expensive new machines, no money and really want a laptop friend can only look to the second-hand market, expect to be able to find a good value for money model. Because of my own practical needs of work, after considering again and again, after spending a month of time to soften and harden, dear parents finally agreed to buy a second-hand laptop. Now I will buy a second-hand laptop the whole process, from the information to step on the spot, and then to buy the machine, until the final payment invoicing process to write out to all of you want to buy a second-hand laptop friends to share.
Intelligence collection
After getting the affirmation of the parents, according to my previous habit of buying a desktop computer will rush the kitten to the Internet to see the information. As the saying goes, "know your enemy and know yourself, and you'll never be in danger", the Internet can see what the whole market for used laptops is now a situation, although the price quotations across the country have a certain difference, but this difference is certainly not very large, so the first to look at the future, you do not have to be afraid of JS roaming offer, but also to determine their own need for the The first thing you need to do is to find out what kind of laptop you want to buy. At the same time also learned that the source of used laptop computers can be broadly divided into the following categories:
1, personal sale (individual users for various reasons and buy off the hands of the machine, some are even more of their own machine discount in the merchant for a good machine, under normal circumstances, the quality of this machine and the color of the machine is relatively good, because the personal use of the machine will be more cherish their own).
2, the company sold (the need to upgrade the machine company sold the machine, the color of the machine is generally not very good, because the company uses a lot of hands mixed, and basically high-intensity frequent use of the machine, the machine of course, wear and tear fast, and part of the machine more or less there is a small problem, the best thing about such a machine is the same type of machine in a large amount of easy to pick).
3, assembled machine and refurbished machine (typical JS sells the machine, in the market number of quite a few, more gentle a little bit of JS just to the original memory or hard disk to change down, and more vicious JS is basically so the hardware are changed, even including the LCD screen. (And then replace it with the appropriate hardware from other problematic machines, some of which are repainted to get a good price).
4, foreign garbage (here said foreign garbage, including manufacturers of stacked goods, such as uneven performance of the machine, good luck can buy a good machine, bad luck on the slow cry, because it is imported, so some of the machines in the use of more or less a little bit of a problem).
5, black goods (also known as thieves, stolen goods, generally very good color, performance is also very good. As for whether to buy, buy what problems, that is not clear).
Finally, after reading the insights of the great N, decided to go to the computer city around, mainly to see what the local spot, the price is how, to put it bluntly is to go to the computer city to understand with those merchants in the sale, there are those notebooks on sale, the price is a specific how. After 4 hours and 12 minutes of hard labor in the legs, finally ended the investigation of the market, the preliminary selection of a rather large-scale merchants whose stock is more, which is also used to buy desktop, because a little bit of the scale of the merchants are doing a better job, the reputation is also relatively good, and there are problems in the future is less trouble, and the kind of business that feel bad to go in or not to look at it for the better. Initially determined to buy the notebook is N600, mainly to see the color is very good, the business offer 6000￥.
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Pre-war preparations
After returning home, we began to make preparations for the inspection of the machine tomorrow. Because the inspection of used laptops is far more complex than the inspection of new machines, so be well prepared beforehand so as not to panic when the time comes. After an hour of hard work, prepared a flash drive, a CD-R (with data but not sealed), a D version of the CD-ROM (operating system), an ordinary VCD disc, a DVD movie and a floppy disk, a dual-machine interconnection cable, a PC card. And prepare the main applications and test software that you commonly use (there are WinCPU ID to detect the CPU, Sisoft Sandra2004 to detect the whole machine, memory test software DocMem, Nokia screen test software, BatteryMark battery test software, keyboard test tool KeyBoard Test). The next thing is to have a good rest and wait for tomorrow's inspection.
Frontal confrontation - hard contact
The next day, I arrived at the merchant's side, because I had already been here yesterday, so I simply chatted with the merchant and went straight to the N600 that I had been looking forward to yesterday, and then I saw a N410C next to it, which attracted my attention. The stickers on the machine are intact, but not a heartbeat, and immediately asked JS learned that this machine is a friend of JS yesterday afternoon to bring, JS friends just bought N410C encountered the company to their own machines, so the N410C has not been put at home did not use, and only now think of selling. Hear JS say so, immediately convert the target, N410C is, after all, thin and light machine, and with COMBO base. Of course, can not immediately table in the form of color, and JS blowing chopping, JS actually agreed to take 6000 ￥, but also send a M300 battery, while JS also boasted that the machine is certainly not a problem to find out what the hardware problems, find a reduction of one hundred, including bad spots and scratches. Hear JS so kind, I feel a little what the problem. After all, the market is now difficult to say, JS is too much. But since I've already asked, it's better to look at the machine first.
Let JS take out the host computer and all the accessories (including CD-ROM, power supply, battery, and docking station), and first of all, of course, test the appearance. Now JS sells laptops if the shell is worn out very seriously will be re-painted or polished, but no matter how JS deal with, the whole appearance of the machine will always make people feel very awkward, because the visual effect of the reflections and the feel is far less than the original good, so personally a little strange feeling, and I chose this machine is not such a problem, whether visual or feel very good, and I can judge that JS does not have any problem, no matter the visual or feel very good, and I can judge that JS does not have any problem. It can be judged that JS did not polish. Then carefully check the body of the body has no hanging flowers and cracks, whether the screws in various places have been disassembled, replaced or even missing traces. Most likely to appear hanging flowers in the bottom of the machine, the top cover front, wrist rest a few places, as long as the hanging flowers can be within your acceptance of the place there is no need to blemish, of course, this should be written down as a basis for price discussions with the JS. If you find a machine with cracks, no matter how small the cracks are absolutely can not be. Because the cracks mean that the machine has been dropped or squeezed, it's hard to tell if there's any damage to the internal hardware.
For the screws in various places, JS will dismantle most of the machines when they are bought, so it is basically impossible to dismantle them without disassembling them, but it is important to know that the original screws have gone through a variety of treatments, and some of them are still special screws, so they can never be replaced. Original screws are coated, and the combination of the machine is very dense, as long as a little more carefully is able to distinguish. I do not know whether JS just said the truth, but the body is really good, the screws do not have any traces of disassembly, I carefully examined the N times before I finally found a 0.5 * 0.5MM in the place of the top cover LOGO small point, JS actually do not believe in the face of the call to his friend, and finally learned that the trace is a friend in the first use of the key hit, hey, less 100 ￥, the JS depressed. JS is depressed.
Casually open and close the screen a few times, the screen in the flip process is slightly tight, of course, if it really is a new machine, this problem exists is reasonable. As long as the screen is not obviously loose feeling can be, if there is a greater sense of looseness, that means that the screen spindle wear is more serious, the screen is likely to be unable to set in the position you want, at the same time the screen line will be affected by the impact of the loose, and ultimately affect the screen display, so this is not to buy the book of course. Open the screen at the same time should also check the screen hook is intact, use the hook is smooth. If the hook is not intact, then the laptop screen is likely to be unable to close tight. For double hooks single switch used laptop must pay attention to the two hooks are not synchronized. After opening the screen to try to knock the keyboard and use the mousepad, very comfortable, each key falls and pops up to make a very dry, no sticky hand feeling. With a little bit of force to hold down the mouse touchpad to all directions rubbing, the touchpad has no signs of loosening.
And then down to the next is the check of each interface, first check the PC card empty slot and fill the empty slot of the removable memory, the bottom of the body of the port replicator file plate, and the port cover is intact and can be a normal action, these small things are not the machine is not enough to look good but does not affect the use of the machine, but it can be used as a cut JS's capital. Prepared PC card and flash drive into the interface to see if the insertion and dialing is normal, if it is very difficult, it means that the inside of the bracket has been deformed. Then look at the network card and MODEM interface pins are intact. Also observe the power adapter interface and the host jack is matched, if inserted more than a cut or very loose, the power adapter is certainly not the original, which is not necessarily a big problem, but always poor contact is always very annoying, and the machine is also damaged. Also look at the anti-theft lock on the laptop, if it is damaged here, it is basically certain that it is black.
Finally check other accessories, see the nominal specifications on the power adapter and host specifications are the same, especially the voltage must be the same, otherwise it will burn the host, the current if different, the adapter current than the host is slightly larger than the host can be accepted than the host if you can not want to be small, which may lead to a long time of charging or the battery is not enough to charge the host in the host of the high load running time may also be due to insufficient power supply to cause damage to the host. Insufficient power supply may cause damage to the host. Make sure the power adapter is 110~240V, otherwise, if you buy a 110V adapter, it will be burned or even damage the host in a moment. Carefully check whether there are traces of glue injected into the joints of the battery's splicing and whether there are uneven seams, if there are then it means that this battery has been opened for repair. Check the base, try to put the machine on the base and then eject it, observe whether the ejector lever is smooth and strong, if not, then we must first consider whether the machine can be easily removed from the base. After a quick check I found that the machine was indeed as JS said it would be, and if I hadn't blown it off, it would have been a completely new machine. It seems that today's luck is really good, but now is not the time to be happy. Because if the above steps of the test are passed, then only a preliminary sure to find a good maintenance, good color machine, but a machine without problems in appearance is not equal to the operation of no problem, so be sure to boot and log on to the system to test.
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The bottom of the kettle - anti-softness
The boot into the BIOS system, of course, the first to hold down the PAUSE key to see the basic configuration. PIII-M 1.2GHz/INTER 830MP, 256M RAM, 40G hard disk, ATI PIII-M 1.2GHz/INTER 830MP, 256M RAM, 40G HDD, ATI RADEON MONILITY/16M. yes, the N410C's high end. The method of entering the BIOS is different because the machine is different, so the keys are also different, the most used are F2, DEL, ESC three, usually when the machine is turned on the screen at the bottom of the display the method of logging into the BIOS and BIOS version number. After entering the BIOS, the main thing is to look at the serial number and the same serial number on the body is not the same, if not the same, in all probability are assembled machine. And you can also see whether the machine is set up a password, if so, must find the JS to ask, if the JS does not know the password, or be careful about the source of the machine it. After looking at the BIOS, of course, the normal boot to the operating system, estimated the time from the self-test to the completion of the system boot, very quickly, indicating that the machine is very normal. If you find that it takes a long time for the machine to fully boot up the system, it's likely that the machine has some hardware problems.
After logging on to the system, because I look at the machine is WIN XP PRO operating system, so first select the Control Panel - User Accounts, to see if the login is not Administrator group of users, do not think that this is redundant, because do not use the Administrator group of users to log on to the system. Administrator group user login will cause a lot of trouble in the future use of the machine, and if the JS does not know the Administrator group login password, then you can be sure that the machine is black. Next is to open the device manager to expand each branch to see if all the hardware has been correctly loaded, if there is a yellow question mark or exclamation point with the machine's driver has not been installed completely, some accessories can not be used, this time must be JS can provide. Plug in the flash drive to see if it can be recognized correctly.
Insert the prepared CD-ROM and floppy disk to observe the work of the optical drive and floppy drive to see if the reading disk is smooth. If it takes a long time for the optical drive and floppy drive to read, it means that the optical head and magnetic head are aging and it is best not to buy them. Try to copy a larger capacity disc to the hard drive, several times if time permits, as some optical drives will not recognize the disc once it gets hot. If it is a DVD optical drive, try to play and read DVD and CD-ROM, don't be afraid of trouble, a lot of second-hand machine DVD optical drive only recognizes DVD but not CD-ROM. since the optical drive is COMBO with burning function, take out the unsealed CD prepared before and try to burn it. The optical drive and floppy drive work fine, except that the wind noise seems to be louder when the optical drive is working.
Used for a period of time without external power supply, mainly to simply test the approximate operating time of the battery, because the battery must try to charge, plug in the power adapter before looking at the bottom of the nameplate logo and power adapter on the reverse side of the logo, the main voltage and current specifications and the host is the same, and is to look at the brand and model of the power adapter and the host of the brand and model of the same, even if the OEM should also be the same. Even if it is OEM, there should be a small line of identification for a certain brand product XX model. If the battery power is higher than 90% is possible not to charge, but just now the use of the battery has been put below 90%, the battery has been automatically charged, and the host on the display light is also lit up. If you find that the battery will not charge at all, it means that the battery, power adapter or charging circuit has a problem, this machine can not be purchased, a laptop and desktop can not use the battery what is the difference? After booting into the system, start counting the time, and then see how the battery is consuming, no one wants to buy a machine with so little battery life.
Install a few of your favorite software (preferably large software such as OFFICE, PHOTOSHOP, etc.) and use it casually to see if it works properly and smoothly. The use of NOKIA screen test software, the screen background into a solid color, and then gently shake the screen back and forth, and tapped the top cover, during which to carefully observe the screen whether there is a splash screen or a larger flicker, if there is, indicating that the machine has a problem with the screen line, it may be when the screen will not work. Pay special attention to the screen whether there is vertical or horizontal through the screen of the bright line, if so, that the screen line has been a problem. Then test the screen for bad dots, a machine with bad dots does feel unpleasant to look at. Then I will adjust the screen to all white, the brightness contrast to the maximum, back a few steps to see if the white screen has uneven brightness phenomenon, especially need to pay attention to the corners and the bottom / right side of the screen, because usually the lamp is installed in these two positions. Generally speaking the screen performance of a used machine is no longer as good as a brand new one, and the screen will be more or less yellowish, as long as you can live with that. If the screen appears to be off-color or appear color spots, etc., you should never buy, that is the screen itself or screen line problem, some may also be a video card problem.
By now, I'm starting to trust JS a bit more, because the color, contrast, and brightness of the screen is perfect. Open the control panel, select the sound and audio device option, try to play the sound, and try to play this sound continuously, while repeatedly adjusting the volume size, feel in adjusting the volume when the sound playback is smooth, at the same time, listen carefully to the speakers there is no noise in the speakers, if the volume in there is still a lot of room to get to the maximum volume before the sound breaks, it means that the machine speaker has problems, may have been injured. Look for JS to ask for a pair of headphones and MIC, use a little, mainly to see whether the sound of the notebook external interface is normal, the normal situation of the headphone output sound should not appear murmur. If the sound is just too fast or too slow on the rhythm, it is generally sound card driver is not installed. Open WORD, enter a paragraph of content, make sure that the mouse and keyboard can be used normally and correctly enter the characters, a little patience to use all the keys on the keyboard, including key combinations to use, if you go back to find that the mouse and keyboard have problems, JS is likely to not recognize the account.
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The final battle - testing
Now, after the initial use of the machine, I feel very satisfied, and ready to use the other test software on the machine to test it properly. I don't need to tell you much about the next tests, the software is very easy to use, but be sure that if you find any problems during the tests, it's best to think more about whether you can change the machine.
After running the test software I brought, I asked JS to SUPER ∏ this program to run the machine, in accordance with the habit of using the desktop as long as you can run through the program, that basically proves that there is no problem with the host. Finally is the detection of hard disk tracks, the easiest way is to run ScanDisk to see, each partition should be detected, the purpose is to rule out the possibility of bad channels, if you see those shells have had traces of touch and fall of the machine to be especially careful. And then look at the purchase of the machine is not with a wireless network card and Bluetooth function. If there is a wireless card, be sure to figure out the type of card, and be sure to see the wireless card in the device manager under the network adapter hardware, some machines just built-in wireless card antennae and switches, but the machine inside the card, do not be deceived by the JS, and if there is really a card, after opening the light or in the right corner of the task bar has a connection indicator, these are the basis for judgment. These are the basis for judgment. I bought this machine because I needed to install my own wireless card, but JS was very honest and told me that there was no card.
Checking the machine can now basically end, and finally listen to the fan sound, if the fan is running with a sharp sound, it means that the fan bearings are worn out. If you don't hear any sound at all that means the fan is not rotating, restart the machine once, because the vast majority of laptops in the BIOS self-test should be incidental detection of the fan, the fan will turn for a few seconds, as long as it will turn on the problem. If there is no fan sound all the time, and make sure that the model of the machine you have chosen is air-cooled, then it indicates that there is a problem with the machine's fan.
Reaping the fruits of the battle
After the above test, can all pass the notebook is basically reassuring, the next play on the eloquence and detection of the problems found in the and JS bargaining, just found a small defect on the body of the JS had to concede 100￥. The last payment to the JS asked for an invoice, in order to avoid future trouble, but also let the JS in the invoice to write a clear purchase of the machine model, configuration, purchase time and warranty time. Then on the JS store immediately charge the machine, format the machine (preferably repartitioned) and install the system, drivers and software required to determine the machine can be used normally. This way you can make JS have nothing to say if you encounter problems.
The second-hand gold rush is definitely a mixture of risk and good quality, and whether you can pick a good one depends not only on your eyesight, but also on your luck. And it's even more difficult to get a good machine at a good price. Here has been the process of buying used laptops, the use of some of the tips introduced to you. Of course, I should say that my luck is quite good, and then I can only wish you good luck. Always remember to be bold and stay calm when buying.