Causes of black screen:
1. The power supply chip is damaged or aged, the screen cable is loose or the main board is short-circuiting the power supply circuit to the screen;
Second, the memory problem, the memory is loose or there is a problem in itself, re-insert it or try another memory;
3. BGA (graphics card. North and South Bridge) package chips are damaged by virtual welding. Generally, there are many cases of virtual welding, and it is good to add welding;
Fourth, there is another case where the screen is dark, which should be sent for repair.
Reasons why the fan does not turn:
1. Power supply problem (maybe there is a problem with the power supply, and the power supply cannot be equipped with a fan);
2. There is too much dust in the fan, and it has not been cleaned for a long time. Try cleaning it up;
3. There is a problem with the computer CPU fan.
The above is the analysis of the reasons for the black screen and the fan not running when the Win10 laptop is turned on. This situation is usually caused by the power supply. If you don't understand or dare not repair it, you can click the blue express line , which specializes in computer maintenance and IT outsourcing. .