Miss Li, my laptop is hp43 1, and it has a black screen.

There are the following possibilities: 1) power failure of the display, or poor contact of the data cable of the display. In addition, the computer is used for too long, and the power cord of the display is easy to be damaged by oxidation;

(2) The motherboard has no power supply;

(3) The graphics card is poorly contacted or damaged;

(4) 4) Poor CPU contact;

(5) Poor contact of memory stick;

(6) The machine is infected with CIH virus and the BIOS is destructively refreshed;

(7) Check the plugging and unplugging, and remove the oxide film on the golden finger with rubber if necessary;

(8) If there is a floppy disk in the floppy drive, it will often lead to a black screen when the computer is turned on or restarted, and it is impossible to enter the system. In order to avoid this situation, you can also cancel the floppy boot entry in the BIOS.

In addition, you can unplug the graphics card, wait for a while, clean up the graphics card slot with a brush, and then plug it back in 5 minutes. I hope I can help you.