Computer boot black screen, can not open the machine how to do

Check the motherboard to see if the cable is loose. If it's all right, it might be a video card thing.

(1) Monitor power off, or monitor data line contact bad. In addition the computer used too long monitor power cord easily oxidized damage;

(2) The motherboard does not have power;

(3) video card contact bad or damaged;

(4) Bad CPU contact;

(5) Bad contact of memory bar;

(6) The machine infects the CIH virus, the BIOS is destructive to refresh;

(7) Check the plug, if necessary, such as the use of rubber and other clear gold fingers on the oxide film;

(8) If the floppy drive has a floppy disk, many times will cause the computer to boot or restart, the computer will appear black screen, and can not enter the system. To avoid this type of situation, you can also cancel the floppy boot entry in the BIOS