What should I pay attention to when buying a second hand laptop?

Pay attention to check the screen and keyboard, pay attention to check whether the hard disk has bad sectors, pay attention to check whether the original hardware of the computer has been passive, pay attention to check whether the computer motherboard has water ingress or overhaul, and pay attention to check the quality of the power supply and radiator.

1. Check the screen and keyboard: Carefully check the screen for scratches, turn on to ensure that it is smooth and there is no noise in the process, and check whether all the keys of the computer's keyboard are working normally.

2. Check whether the hard disk has bad sectors: The hard disk of a second-hand computer is the most likely to have problems, whether it is a solid state drive or a mechanical hard disk, before purchasing, be sure to check that the hard disk has bad sectors. If there is a bad road, it will not be long after buying it back and using it, and it will be scrapped and unusable.

3. Check whether the original hardware of the computer has been passive: the computer only allows and accepts the installation of memory modules and the replacement of solid-state drives, and other computer hardware does not accept changes, and each hardware in the computer is labeled with the original serial number or batch number, and the label information on the hardware must be consistent with the label information on the back of the computer, this step is to determine whether the main body of the computer is original.

4. Check whether the computer motherboard has water or overhaul: whether the computer has "dark disease" mainly depends on the motherboard, the motherboard has been overhauled or the motherboard has been overhauled, which will affect the performance and stability of the computer. There will be marks on the motherboard that has been liquidated, and the weld marks can be seen at a glance on the overhauled computer motherboard, and you can request the store to disassemble the computer when you buy a second-hand computer.

5. Check the quality of the power supply and radiator: When choosing a second-hand computer, it is best to choose a brand new product for the power supply and radiator. Because the motors and bearings of second-hand power supplies and radiator fans will be worn, not only the noise is high, the heat dissipation effect is poor, but also can easily lead to other hardware problems.

When buying a second-hand computer, you need to pay attention to:

1. There are no traces of damage to the screen, because when the machine with traces is used for a long time, the refraction of light will seriously damage people's eyesight.

2. Carefully observe the size and display effect of the display screen, and consider the display effect and size of the display screen in connection with the display screen.

3. Carefully check the appearance to see if it has been disassembled or collided, and whether there is any cracking.

4. Determine whether the original hardware of the computer has been passive, the laptop is only allowed and accepted to install memory modules and replace solid-state drives, and other computer hardware is not allowed to change.

5. Detect whether the computer motherboard has water ingress or overhaul. A motherboard that has undergone an overhaul or a motherboard that has been overhauled can affect the performance and stability of your computer.

6. Pay attention to the dead pixels of the LCD screen. The most common are white dots and black dots, and the general way to identify black dots is to turn the entire screen background to a white screen, and the white dots are just the opposite, turning the screen background to black.

7. Detect the quality of the laptop keyboard. Before buying a second-hand laptop, you should open the word document one by one, because the keyboard is generally not covered by the warranty.