The reason why the computer can't be turned on and the keyboard light doesn't work and the corresponding solutions 1;
1) The monitor plug is loose or the signal line is damaged. Plug in or connect with a new cable.
2) The keyboard socket is loose or damaged. Plug in the plug tightly or try with a good keyboard.
3) The gold finger of the memory stick is dirty. Wipe the gold finger of the memory with rubber strip, and clean the slot with a brush.
4) Goldfinger with discrete graphics card. Do the gold finger cleaning of the graphics card and clean the slot with a brush.
5) 5) If the CPU is overheated, the motherboard will be shut down for over-temperature protection. Check whether the CPU fan is turned on, otherwise the fan is broken and replaced. The fan plug of the motherboard has dropped, so plug it in again. The auxiliary circuit of the motherboard is faulty. Check whether the electrolytic capacitor is bulging, replace the electrolytic capacitor or send it to the motherboard for maintenance.
6) There is too much dust in the machine, which causes the fan to rotate at a low speed. Please remove the dust.
The reason why the computer can't be turned on and the keyboard light doesn't light up and the corresponding solution 2:
1, turn it off, then unplug the socket behind the mouse and press it again. It works well, and so does the keyboard.
2. If the mouse and keyboard are installed in the power-on state, it will not work well if it is turned off and turned on again.
3. If none of the above works, first check whether the external wiring of the computer is connected properly, and then plug in all the wires to see if the fault is eliminated.
4. If the fault remains, open the main chassis, see if there are any redundant metal objects in the chassis, or a short circuit caused by the deformation of the motherboard, smell whether there is a burning smell in the chassis, whether there are burnt chips on the motherboard, and whether there are damaged capacitors around the CPU.
5. If not, clean up the dust on the motherboard, and then check whether the computer is normal.
The reason why the computer can't be turned on and the keyboard light doesn't light up and the corresponding solution 3:
If the host indicator is on or off, there is no display on the screen. If the poor connection can be ruled out, it is generally a poor connection of the memory stick.
Suggestion:
1. Turn off the power, open the chassis, plug in the memory module again, and use the eraser to wipe the golden finger in one direction (just scrape the thumb and the back of the nail). If you can't operate it, it's easier: just kick the chassis (note the position: the right center of the left and right shells of the chassis without interfaces at the back; Note: treat the chassis as a cat and dog, you just want to scare it, not hurt it.) If it is a notebook, you can't kick it, and other operations are the same.
2. Turn off the power supply, open the chassis, and plug the graphics card again. And plug in the data cable between the monitor and the graphics card.
3. If the indicator light of the monitor is not on, please look at the back of the monitor and plug in the power cord of the monitor.
These are the reasons why the computer can't be turned on and the keyboard light doesn't work, and the corresponding solutions. Bian Xiao mainly talked about three major situations and three solutions. I believe that after reading it, you should be able to master the relevant knowledge and content quickly. When this computer breaks down, try to take corresponding measures to solve it according to different situations. I believe it should be helpful to everyone. If it can't be solved, it may take some time to take the computer to the after-sales service center for repair. Please be patient.