One, the general principle of purchase: Since the purchase of used computers, of course, the most important thing is the price, the choice of used machine configuration should follow the principle of good enough. Choose a second-hand computer generally do not consider scalability, because all the second-hand computer parts are out of the product, and the future of the elimination of the product performance will only get better and better, the price will be lower and lower. In focusing on the price at the same time, the quality is also a factor that must be considered, used computers and their accessories usually do not have good after-sales service, buy poor quality parts will affect the performance of the whole machine, and in serious cases will lead to the whole machine can not run, and thus the quality of the parts to check the quality of the machine should be the focus of the need to use a longer copy of the machine, to check the whole machine performance and compatibility. The funds are slightly more generous friends, should also consider the cost-effective, in the motherboard, CPU and other accessories on the performance of the machine has a greater impact on a little more investment is worthwhile. It is best to pay attention to the brand of the accessories, with high brand awareness of the accessories assembled out of the computer generally have good compatibility, the chances of problems will be greatly reduced. When choosing second-hand accessories on the appearance of the old and new parts do not have to pay too much attention, for example, "wash" clean boards and refurbished casing after the monitor looks very good, but its performance will not be because of the appearance of the newer to be improved.
Second, the purchase strategy
1. Time: buy used computers (including the purchase of new computers) is best not to choose Saturday, Sunday, because the weekend purchase of more customers, the business of choosing the customer's margin of error, the user in the negotiation of prices and the purchase of accessories may be in a disadvantageous position. Negotiation of the whole configuration, the whole price, check the performance of the whole machine takes a long time, so when you buy a used computer is best to enter the computer city just when the door is open, to become the first customer of the business, in the case of the businessman can not know whether or not there is a business that day or how much business, to start your purchase action is very favorable.
2. Location: the competition between used computer sellers is quite fierce, therefore, in the second-hand computer sales store is more concentrated in the purchase of second-hand computers is very favorable, to Chongqing, for example, in Shiqiaopu Taixing computer city on the 4th floor and the liberation of the liberation of the Linjiangmen big world of the computer city on the right side of the 2nd floor is the second-hand computer sales store is most concentrated in these places to buy second-hand computers at a low price, the choice is also larger. The most important thing is that you can buy a used computer at a low price and have a wide range of choices.
3. Merchants: the size of the second-hand computer sales stores are large and small, some stores have more inventory, some stores have less inventory, we should try to choose a larger storefront, more inventory merchants, because less inventory second-hand merchants usually do not store all the accessories you need, you need to go to other second-hand merchants to adjust the goods, and according to the way to adjust the goods to buy the accessories price is usually higher. In addition, you will have a wider choice of accessories when you buy from a dealer with a large inventory. Some merchants who mainly sell new machines can sometimes provide used parts, but these merchants usually go to the second-hand merchants to transfer goods, it is recommended not to buy used parts in these merchants, but should go directly to the second-hand computer sales store to buy, so as to avoid being two merchants to earn double profits.
Three, the purchase of the preparation work: the purchase of used computers should first meet your application needs, and secondly should be based on the funding of the second-hand computers you need to make a certain understanding (please refer to the newspaper's 11th issue of the C16 version of the relevant articles), for example, like to play the game of the user should choose to at least support the AGP 2 × motherboards and display cards, and the funding is not generous office users would be better off choosing the Integrated motherboards, that is, can save overall expenses, the system compatibility is good. For users who are not familiar with hardware, it is best to find an expert to choose a configuration for you according to your needs. In addition, it is best to prepare more than one or two sets of configuration programs to facilitate the allocation of machines according to the availability of merchants to choose. For users who need to use special software or hardware, it's best to bring your accessories with you so you can check the compatibility of your device.
Four, bargaining strategy: before negotiating the price of the whole machine, to understand the second-hand parts dealers whether you need a higher value of the second-hand parts is very important, such as monitors, motherboards, display cards, hard disk, etc., it is best to talk about the price before the inspection and roughly check the quality, so as to avoid the phenomenon of exchange, transfer. The occurrence of exchange, transfer, usually need to renegotiate the price, in general, most customers lose. Users who are not familiar with the price of hardware, you can put forward to the second-hand dealer your application needs and the approximate price range (such as 1,000 yuan, 1,500 yuan, etc.), second-hand computer dealers will immediately write a set of configurations for you that he can provide more suitable for your needs. It is very important to understand the after-sales service before negotiating the price, because the after-sales service has a certain impact on the price, for most of the used computer dealers would rather reduce the selling price than to provide after-sales service, which is very important for customers. Most of the prices proposed by used computer dealers leave room for price reduction, but price negotiation requires strategy, generally speaking, in the second-hand stores are more concentrated, second-hand dealers are more competitive locations to buy machines, the second-hand dealers proposed price reduction space is smaller, while in the second-hand stores are fewer places, the second-hand dealers proposed price reduction space may be larger. Selecting more merchants, filling out more configuration sheets, and triggering competition among merchants to get the best price is one of the techniques of price negotiation. Note that any used computer merchant will state in different ways that other merchants are offering low-priced, low-grade goods, and it is the price that you should emphasize when negotiating.
Fifth, the second-hand accessories to buy and check
1. monitor: buy a second-hand monitor is best to look at the brand and date of manufacture (in the back of the monitor is usually marked with the date of manufacture), you can also use the PowerStrip test, which can identify the monitor's true "age". Specific checks should pay attention to the monitor's maximum resolution, focus, brightness, stability, etc., the basic method is as follows: the maximum resolution supported by the monitor to observe the display edge of the characters, focusing on a good monitor text sharp, clear characters; brightness to the maximum to check whether there is a sweeping line or tilted white horizontal line, this is the case of the aging of the CRT or or the monitor of the performance of high-voltage circuits Bad; in the process of adjusting the brightness, the screen should be no obvious phenomenon of stretching and flicker phenomenon.
2. Hard disk: hard disk is the most vulnerable accessories, buy used hard disk should pay more attention to its quality. When checking the hard disk, you should first pay attention to listen to the hard disk to start and run the process of whether there is a strange sound, in the quality of the check, pay attention to the use of Ghost and Windows formatting tools can not be checked to the hard disk bad channel, with the "Format" command to format the hard disk is sometimes unable to check some of the problems, it is best to use the "Scandisk" command to format the hard disk. It is better to use "Scandisk" to detect the whole disk (it takes a long time) whether there are bad sectors; in addition, you should pay attention to whether the temperature of the hard disk is too high after running for a long time (some hard disks will have problems after running for a certain period of time).
3. CPU: the most important accessory to determine the performance of the machine, from the point of view of improving the cost-effectiveness of the machine, after determining the motherboard to buy, it is recommended to try to choose the motherboard can support the highest frequency CPU. current second-hand CPU is more valuable in turn should be Pentium Ⅱ, Celeron, K6-2, Pentium MMX, K6, M Ⅱ, Pentium, it is recommended to choose the main frequency in 166MHz above the CPU. used CPU most will not appear quality problems, as long as the normal installation of the operating system, in the operating system can run multimedia programs can be considered to be of high quality, pay attention to some merchants may be overclocking the CPU for sale. At present, there are few used PIII in the market, and the price is expensive, to buy PIII friends pay attention to, at present, there are a batch of Slot1 architecture of PIII 733 in the market, the CPU is actually transformed into with the laptop processor Celeron Ⅱ 500 (128KB L2 Cache, Socket370 architecture) and Celeron Ⅱ adapter, this kind of CPU is able to work with some VIA 6000, and can run multimedia programs in the operating system, it can be regarded as the quality is good. The CPU is able to overclock on some VIA 693 and BX chipset motherboards running at 133MHz external frequency and displaying PIII 733.
4. Motherboard: The motherboard is the most important accessory in determining the performance of the whole machine, and those who have a little bit more money can choose to support 100MHz external frequency and AGP 2× motherboards such as those using the VIA694X, i810, SiS630, VIA693, 440BX, Aladdin5, MVP3, MVP4 and other chipsets of the motherboard, for those who pay attention to the price, you can choose the SiS620, TX, VX and other chipsets of the motherboard. If you are in a position to do so, you can consider choosing a second-hand motherboard from a brand-name manufacturer, which has good stability and can solve a lot of compatibility problems after upgrading the BIOS. The quality of the motherboard check is very important, first look at the motherboard has not been repaired traces: the main thing is to carefully observe every corner of the motherboard to see if there are no traces of being welded. Although some repaired motherboard can light up the monitor, but there may be some unknown hidden problems. Secondly, you should also look at the motherboard's BIOS chip has not been replaced: unscrupulous vendors in order to their own profit, may be the brand-name manufacturers of the BIOS chip instead of those re-flashed after the price of the BIOS chip, which may make the performance of the motherboard is reduced. Frequent crashes in the installation of the operating system should be firmly requested to replace the motherboard. Each interface on the motherboard should also be checked one by one, any interface problems will bring difficulties for future use. Buy AT motherboard friends should check whether the merchant has installed a good serial port, parallel port (connected to the printer), PS / 2 port, etc., and these interfaces are used normally.
5. Optical drive: check the optical drive to examine the optical drive's ability to read the disk, it is best to bring a poor quality CD-ROM on the spot test to see if the reading disk is smooth. Generally speaking, low speed used optical drive reading performance is better, mechanical failure is also less.
6. floppy drive: check the floppy drive to examine its compatibility and read-write capability, bring a formatted, copy a file on a floppy disk, first check whether the floppy drive can read all the files in the floppy disk, and then deleted, write and format the operation, so that at the same time check the floppy disk drive interface of the motherboard.
7. chassis power: chassis should choose a better case strength, some chassis strength is very poor, a little force will be deformed, so that the board inside the box to produce relative displacement leading to failure. The internal space of the chassis should be selected to facilitate heat dissipation. Power supply is best to choose the nominal power of 230W, it can ensure the overall stability of the computer, and please note that the power supply fan is not stopping, whether to make a large noise.
Choose other accessories are generally not easy to be deceived, such as the choice of graphics cards only to determine the choice of PCI interface or AGP interface; sound card to determine the choice of PCI interface or ISA interface, the choice of memory to consider the speed and capacity, the mouse and the keyboard to consider the comfort and so on, these can be based on your preferences to choose from, most of the other accessories are non-perishable accessories, in the purchase of the A little attention in the purchase can be. Lastly, for users who do not have access to the Internet, it is very important to keep the drivers for the motherboard, display card, and sound card, and it is best to ask the second-hand dealer to burn a CD-ROM with the required drivers for you.