How to buy a computer to buy a laptop how to see a computer is good or bad, for

Step 1: Observe the laptop's outer casing Carefully check the appearance to see if it has been disassembled or collided with, and whether there are any cracks, if you find this type of problem, do not buy it, no matter how cheap its price is. However, if there are only some minor scratches, you can consider it, this is because due to the mobility needs, some small friction is inevitable. And to buy a used laptop, look at its thickness, size, weight, and compare it with similar used laptops, and choose who to give up and who to take away, depending on your 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 the purchase should pay special attention to: 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 moved back to a machine affecting the eyesight would be too much to be 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 pressure 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 should be observed diagonally up and down, left and right, if in whichever way 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 brightness of the LCD 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," at this time consumers can respectively establish the screen background of red, yellow and blue primary colors to simply identify it. Step 3: carefully identify and test the components of the notebook carefully check the laptop's CPU, hard disk, memory and other components, the purchase of the best machine can be dismantled 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 generally users 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 is too long, that the cluster area must have a problem. About memory, used notebook memory from 32M to 256M are available, to 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 second-hand laptop because there is no complete interface is very necessary. In today's notebook computers, with the popularity and application of external storage devices, USB interface has become a desktop or laptop necessary devices, 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 Check whether the keyboard, mouse, optical drive, floppy drive, modem is available and good. Last time in the second-hand market to see a second-hand laptop keyboard shiny, wear and tear is very serious, in which case there is no need to buy, change the keyboard will be a few hundred dollars. 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. Built-in floppy drive, CD-ROM drive, modem, etc. is available, please try one by one, as long as the computer within the device can not miss the inspection! Step 6: Try to get the after-sales service of the second-hand business 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 that there is no driver, 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 the model of the 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! Whether the repair 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, there are compatibility issues such as the possibility of upgrading the laptop computer is almost zero. In the current laptop market, used laptops also accounted for a considerable part of the proportion. After all, used ones are much cheaper, so if you don't have a very high requirement for a machine, then a PII class laptop in the range of 5,000-7,000 dollars will definitely suit you well. In the purchase of second-hand laptop, it is best to find some larger specialized in the business of second-hand laptop business merchants, rather than go to find some small-scale business stores, some buy regular laptop stores will also engage in some second-hand laptop trading, they provide the second-hand laptop is usually very good color, and will also provide a certain amount of warranty services, in the configuration is also higher, only the price may be expensive! A little bit, through them to buy used laptops is also a good choice. As the quality of used notebooks vary, the price is often not transparent, so the bargaining room is also very large, then, it may be worth running a few more, the first to understand the approximate price, and then in the purchase of the time, according to the quality of the machine and the color of the price cut, used notebook profits are very large, may wish to be ruthless in cutting prices, as to cut the number of how much it depends on your own skills. Used laptops in the warranty service is usually very limited, some even no, in the inspection, in addition to pay attention to the above mentioned points, but also have to pay attention to the driver and machine settings, now we often see most of the second-hand laptops smuggled from abroad, that is to say, and **** about the same, and in the driver and the machine settings may be incompatible with the Chinese operating system environment that we use. Chinese operating system environment may be incompatible with our use of the place, so pay special attention to this point, in addition to buying a used laptop to spend more time and effort to choose, must be careful, cautious, do not wait to buy home only regret. Buy used laptop to go there? At present, the sale of used laptops, mainly in some used laptop market, or online shopping malls. Here is a brief introduction to the difference between these two stores, and the things you should pay attention to when buying a used laptop. Buying used laptops online is convenient and fast! It's not uncommon to buy products online nowadays. As early as three to five years ago, online consumption has become fashionable. Easy and fast way to buy, so many young people for the "crazy", and today, more and more online shopping malls come one after another, TV, radio, magazines everywhere their ads, with the cover to describe it is not excessive. Today's online shopping malls, compared with the past, the variety of goods has increased a lot, from the needle and thread, daily necessities, to cars and airplanes (Note: toy airplanes) are sold, without leaving home, you can buy a favorite commodity. Of course, in addition to a wide range of goods, the online shopping mall is also a "second-hand trading" section, in which we can put their own items for sale on the Internet, labeled with their own heart selling price, for sale. The "second-hand trading" section is often the "Taobao" mecca for everyone, which is like an online "yard sale". In these second-hand products, of course, there is no lack of some second-hand laptop computers. These second-hand notebook is mainly to IBM, Toshiba, SONY, HP and some other internationally renowned brands of products, of course, there is no lack of some of them in the classic machine, although a few years ago, but because the product itself is well-made, so the product now does not look very old, and then again, now also popular retro well. The old look, also full of cool. Good thing although more, but consumers in the online selection of products, a little attention should be paid to the following points to buy matters, in order to facilitate your more good, rest assured that you buy the goods they want. 1. Try to choose the same city transaction or cash on delivery to buy, do not easily remit the payment to the field or other people's bank accounts to go, one hand to pay one hand delivery is always right. 2. After getting the goods must be carefully checked, in addition to hard disk, keyboard and other routine checks, but also pay special attention to how long the laptop's battery can be used to see if the battery has not been dismantled. A durable battery is very important for the notebook, otherwise it becomes a mobile PC. 3. Whether the seller is a unit or an individual, it is necessary to agree with its warranty, if the goods do not forget to ask for an invoice. It is best to discuss with the seller for a certain period of time replacement period. If you want to buy a used laptop online, then it is recommended to go to some large online shopping malls, such as eBay, Taobao and so on. Now there are some malls, specifically for online transactions launched a corresponding protective measures, such as Taobao's "Alipay" service, which is Alipay company for online transactions launched a special security payment service, the essence of its operation is to Alipay company as a credit intermediary, in the buyer to confirm receipt of the goods before the buyer and seller to temporarily hold The essence of its operation is that Alipay acts as a credit intermediary and temporarily holds the payment for the buyer and seller before the buyer confirms receipt of the goods. Used laptop stores Now buy used laptop people, most of them still like to go to the store inside their own turn, after all, only in the store, consumers can see the real machine, hands-on experience of the product is more real than looking at pictures on the Internet, but also be able to further understand the product. Especially used notebooks, old and new, whether the shell has obvious scratches, breakage, etc., after they have seen with their own eyes or rest assured that some. Currently in Zhongguancun this side, more concentrated second-hand laptop stores have Zhonghai, Guotou and so on. Here it is recommended to buy a second-hand notebook friends, try to go to this large-scale second-hand stores to buy, a more business here, the price is more transparent, the merchants are more centralized, cut the price is more convenient, this is not for sale to go to another. In addition, this kind of operation for many years of the second-hand market has formed a scale, so in case of any problems with the goods, to find the merchants can not be resolved, then you can directly to the management of the market to complain. The most important thing about buying a used laptop in the market is that you should never buy a used laptop from an informal source in an informal place. Often come to Zhongguancun friends know, on the side of the road or flyover, there are often some peddling second-hand goods vendors, they will generally come to the side of the passers-by, to sell you some cheap second-hand goods. Some people who are greedy for cheap goods buy them when their hearts are soft, but when they return home, they will find that the goods they bought are basically fakes and defective goods. Moreover, most of these goods are imported through illegal means and there is no quality assurance at all. Consumers who buy such things are just like taking money down the drain. At the same time, some unscrupulous vendors, but also the internal parts of the second-hand laptop private replacement, substituting good for bad, to deceive consumers. Or through the software, the hardware configuration of the notebook to modify, a product to be outdated into the mainstream configuration of the new product, the average consumer may be deceived. So consumers should go to some of the more formal large-scale second-hand machine stores, to buy. Notebook by virtue of small and portable advantages, has been favored by people. Although compared to the previous, the price of laptop computers fell a lot, but still relatively expensive, many friends with limited budget have turned their attention to the second-hand laptop market. But because of the complexity of the origins of used laptops, new and old color varies, selling laptops businessmen and no lack of self-aggrandizement, so the selection of used laptops has become a big problem. Here I briefly introduce a few points of attention to selecting a used laptop, I hope to help you buy a machine. Pay attention to the battery time problems Battery is the source of life of the laptop, but also one of the fastest aging laptop accessories, most of the used laptops on the market are used two to three years of products, and an ordinary lithium-ion battery in the use of two to three years will be more or less aging, and some of the range of time is only more than 1 hour. Some merchants in the sale of used notebooks will replace the battery cell, the surface looks like the battery life is extended, but this is an undesirable behavior, because the internal structure of the laptop battery pack and the circuit is more complex, the replacement of the battery pack has a greater chance of failure, and very often in the use of a few days after the battery performance will be a sharp decline, or even damage to the body of the notebook, so it is not recommended to buy the replaced battery. Therefore, it is not recommended to buy a laptop with replaced batteries. Of course, if you buy a laptop just as a fixed use, and can be linked to the aspect of the power supply, then the battery problem has become less important, can standby for more than an hour of the battery can be used as a UPS power supply. Screen spindle can not be ignored In addition to tablet computers, almost every laptop should have this screen spindle, and the spindle is also every time you use the laptop to wear mechanical parts, so the screen spindle wear is also an important issue in the selection of second-hand laptop. If the spindle is too loose, then the laptop will be very awkward to use. The shaft is not hidden, consumers can directly see, but those selling laptops JS will usually add a "loose can be adjusted to tighten" excuse to deceive consumers. Some laptop screen spindle loose indeed can be adjusted by adjusting the screws to adjust, but most of the laptop screen spindle is not adjustable, when the spindle in the middle of the damping material after wear, can only replace the entire spindle. Even for those laptops that can be adjusted, the damping material is already worn out, so it won't be long before it becomes loose again. Imagine how a laptop feels when the screen suddenly collapses during use. Screen bright spots, bad spots and dark spots LCD bright spots and bad spots most consumers are still familiar with, but not everyone understands the dark spots on the screen. Dark spots are more hidden than bright spots and bad spots, and affect normal use more. Dark class is as small as a soybean, large may be as big as a thumb, and bright spots and dark spots are different, dark class is only a slightly darker local color, in light colors do not pay attention to observe out, change into a dark color background simply can not be detected. There are two main reasons for the formation of dark class, one is because of external forces caused by extrusion, such a dark spot area is very small, the middle of the color is deep, the outer layer is relatively normal some, in the thin and light notebooks on the more common. The other kind of dark spot is caused by the aging of the LCD screen, this kind of dark spot has a larger area, and it is possible to continue to deteriorate. Because the dark spots are only slightly darker than the surrounding color, it is easy to be hidden by the special design of the desktop. So when picking a laptop try out a few more backgrounds or check it with professional testing software, such as Noika Ntest, which looks for bright spots, off-color, and other problems. In addition, LCD brightness decline is also a common problem of used laptops, generally can not be avoided, not very obvious if you can accept, but if you find that the LCD panel has been obvious yellowing is best not to buy. Attention to view peripherals and interfaces Used laptop peripherals and interfaces is also a very high failure rate of the zone, the keyboard does not work or interface contact problems occur from time to time, these peripheral interfaces are very important, and many consumers are in the inspection of the machine ignored these problems. In the many interfaces used in the most should be considered a USB interface, audio interface and network interface, especially the USB interface appears to be more important. USB interface is a common failure of the interface is no voltage, in this case, the mouse and USB flash drive and other devices without power can not be used normally, and with the power supply of the device, such as printers, scanners, etc. can be used normally. So I suggest, when checking the USB interface can bring a USB flash drive or mouse to test, other interfaces, such as network cards, Modem, speakers, serial, parallel, PCMCIA, MIC interface and infrared interface is best to try. Keyboard, mouse is the most important input device in the computer, the frequency of use is also the highest, most of the notebook keyboard is a special 83 or 86 key design, when you buy, be sure to try each key is sensitive, whether the feel is comfortable, whether the keys are still resilient, whether the handwriting is clear. Keyboard malfunction is actually a very serious problem. Although not every key on the keyboard is commonly used, they are indispensable. When you find that one of the keys is not working, the vendor may tell you that it is an "insignificant" key and that you just need to replace it with a key. However, this is often not the case, as one key may cause the need to replace the entire keyboard, and replacing a laptop's keyboard usually costs a few hundred dollars, which is not worth it. In addition, because most people use the notebook are external mouse use, and therefore feel that the notebook's touchpad becomes dispensable, in fact, not, imagine you forget to carry the mouse days need to be how to live it. Internal injuries are more important to be cautious against overclocking the CPU. processor is always the core equipment in the computer, so the purchase of notebooks must pay enough attention to the best in the choice of a brand of a model of second-hand notebooks after the Internet to check the standard configuration, pay attention to the frequency of the CPU, you can also use some of the occupation of the test software to test. the CPU's performance is directly related to the performance of the entire machine in order to make the second-hand notebook can also meet a certain period of time. So that the second-hand notebook can also meet the use of a certain period of time, in the purchase of the proposal to try to choose the factory time near the main frequency of the machine, because the processor of the laptop computer generally can not be upgraded. Be wary of hard disks with bad sectors. The hard disk itself is a relatively fragile device, but also one of the laptop's vulnerable components, the existence of bad hard disk for the overall stability of the machine is quite unfavorable, if the hard disk is still abnormal ringing or in the use of the process of speed plummeted, it is necessary to raise vigilance. Many second-hand laptop hard disk used in the market are relatively old, generally 4200rpm, 512KB cache hard disk or even older models, the capacity of most of the 20G below. If you feel that in addition to the hard disk, the machine is satisfactory in all aspects, then you can consider replacing a new hard disk, after all, the laptop in the use of the process, the data saved in the hard disk appears to be very important. Memory capacity should not be too small. The size of the memory capacity directly affects the performance of the machine to play, the current market used notebook memory capacity are between 32MB to 128MB, there are a few in the 32MB below, try to choose the capacity of more than 64MB when buying, preferably more than 128MB, or perhaps their own upgrades to the 256MB will be more appropriate. When purchasing, you need to pay attention to which kind of memory is used in the laptop, and whether there is a matching model for upgrading. Warranty issues also need to pay attention to The biggest disadvantage of used laptops may be considered its warranty. Although some second-hand laptop business can provide some after-sales service, but this after-sales service is too small, and the time is often very short, usually only a short month. And basically most of the used laptops have no after-sales service, if the laptop malfunctioned, you can only bear the cost of repair yourself. But because it is a common situation, I can only recommend that you try to choose a larger scale, more machines, accessories complete point of the business to buy, this kind of business is often better reputation, maintenance is also more convenient. Summarize Although the second-hand laptop has a relatively cheap price, cost-effective is also very high, but when you buy or to consider your motivation to buy a second-hand laptop and use. Some people are in order to play games, some people just deal with some documents, on the Internet and so on, in addition to some of the advertising design or video editing and so on the laptop requirements are higher, the ordinary configuration can basically meet the requirements. So in the purchase must be based on their own needs to choose, for example, you want to type and so on, spend more than two thousand dollars to buy a used laptop Ben2 is enough. In short, for the purchase of used notebooks, the need to rationally analyze their own needs, the courage to receive their shortcomings, dare to face the failure after the purchase.