How to pick a secondhand notebook

First step: Carefully identify and test the parts of your notebook

Be wary of second-hand laptops using desktop CPUs to replace laptop CPUs with despicable practices. Carefully check the laptop CPU, hard disk, memory and other components, it is best to choose to open the machine to see in person. The same frequency CPU general users will not notice, but the use of desktop CPU and notebook CPU is very different, due to different calorific problems, so that the CPU emitted heat in the notebook can not be scattered, resulting in system instability. Therefore, in the purchase process as far as possible to request the CPU on-site inspection.

About memory, second-hand notebook memory from 32M to 256M have, to try to choose more than 64M of memory, preferably 128M above. Memory at the time of purchase, because some notebook computer memory is very special, has now been discontinued, can not be equipped with another. In addition, in addition to the card, such as graphics card should be seen clearly in person.

And for the hard disk, because the hard drive can not be seen through visual observation, only through the software method to detect, detection software can be used DM, Norton, etc., through DM, Norton Scan, DM time is longer, Norton takes a short period. The scanning process must be smooth and uniform, if which cluster area is too long, it indicates that the cluster area must have a problem.

　　Step two: Carefully observe and check the LCD screen

This is very important. As we all know, LCD screen is the most expensive parts of notebook computer accessories, accounting for the cost of the entire machine 20%~35%, so purchase should pay special attention to:

1. The screen has no damage marks, because the traces of the machine for a long time use, the refraction of light will seriously damage the eyesight of people, accidentally moved back to a machine that affects vision is not worth it.

2. Carefully observe the size and display of the display, the display effect and size of the display and the price to consider, of course, can also be used to bargain.

3. Identify the color of the display in detail. Observe the color in addition to the observation screen is 16 color, 256 color or 16 true color and 24 bit true color, but also in its upper and lower left and right oblique observation, if in any respect can accurately see the screen color, can determine is true color. Otherwise, if you can only see in front of it to identify the color, it is pseudo-color. You can hold a high-priced liquid crystal display at the merchant, and place it next to the notebook you want to buy, and compare their brightness, contrast and reaction speed, visibility and other parameters in the same interface.

4, pay attention to the display delay performance and brightness. In the selection of liquid crystal display, the main fact should be its delay length, if the delay time is too long, the eyes will feel very tired. At the same time brightness is a weak spot of the LCD screen, popular type of liquid crystal brightness is generally in the 200cd/㎡ (lumen) lower than the brightness of the display is not available. There is also in the brightness of the time do not look at a single, to cooperate with the contrast adjustment to see. Some liquid crystal display brightness no matter how adjust, the result contrast of a tune thought highly is very dazzling, very uncomfortable. In short, look at the eyes of the comfort and beauty prevail.

5, pay attention to the bad point of LCD screen. The most common is the white dots and black spots, everyone in the purchase of the use of the following simple method to identify: The general black spot identification method is to white screen the entire screen background, the black point will generally not escape your eyes; the white point is the opposite, the screen background to black, this time the white point will show the prototype! However, in addition to white spots and black spots, and sometimes other color points ", this time consumers can establish a red and yellow and blue three primary colors of the screen background to simple identification.

　Step three: Observe the outer enclosure of the Notebook

Carefully check the appearance, to see if it has been demolished or collided, there is no cracking, if found this kind of problem, no matter how cheap the price is not to buy. But with only a few minor scratches, consider this because some minor friction is unavoidable due to the need for mobility. and buy second-hand laptop to see its thickness, size, weight, and the same kind of second-hand notebook comparison, who take who, according to their actual needs. Fourth step: To see the interface of used laptops, there is no complete interface is very necessary. In today's notebook computer, with the popularization and application of external memory devices, USB interface has become a necessary device for both desktop and laptop, the USB port is an important interface.

So it's best to have a USB connection to buy a second-hand laptop. In addition, infrared transmit and receive functions are also an essential feature of the current notebook. And when buying a second-hand notebook, there is an important purchase condition is to see its in-machine power. External power is a must have, no battery is absolutely not, so look at the power is also the main is to see the good or bad battery, that is, the length of the battery life.

For secondhand, Ni-MH batteries generally within one to two years can be used for one hour, lithium-ion batteries can be used for two hours, this is the most basic requirements, otherwise do not consider.

　　Fifth step: Check peripheral condition

See if the keyboard, mouse, optical drive, floppy drive, modem, etc. are available and useful. The last time in the second-hand market to see a second-hand notebook keyboard glossy, wear is very serious, so that you do not have to buy, change the keyboard will be good hundreds of pieces. Open a word processing software at the same time, try each key on the keyboard is available, the mouse is flexible.

Built-in floppy disk drive, CD-ROM, modem, etc. is available, please try each, as long as the computer can not miss the device!

　　Sixth step: Try to strive for second-hand business after-sales service

This should also be the last step. Remember to retrieve all the accessories (batteries, power cords, etc.), graphics card sound card driver also want, but most of the sellers said no, the driver if it does not matter, you can go to the notebook computer manufacturer's website, download the model of the computer's full set of device drivers.

Finally, a special important matter, the second-hand notebook computer generally have a two or three-month warranty change (repair) period, must be a dealer to change (repair) period written on the invoice, and in the second-hand notebook several times to test machine, to find all the hidden problems, otherwise over the warranty period, Again want to repair this kind of computer, especially the hardware part of the fault can be trouble, and must consider whether the future maintenance is convenient, if not buy accessories, the machine is cheap also can not want, because the notebook computer internal space, parts shortage, there is a compatibility problem and so the possibility of laptop upgrade is almost zero.