Failure Analysis: Basically the possibility of software failure is very low, should belong to hardware failure. The biggest possibility is that the hardware appears loose, because the host may have encountered vibration when moving the computer to cause hardware loosening. Including the graphics card, the loose memory, the second is the connection line of bad contact will also cause computer monitors do not show the phenomenon.
Workaround:
One, in fact, only careful testing can find out where the computer is malfunctioning, first of all, you will be your computer on the wiring in the plug again, the most important thing is the monitor to connect the computer that line, learn to worry about this situation, This is the computer connected to the display of the cable for a long time and then unplugged back into the possibility of contact with the loose signs, you may plug into the disconnected, and then plug it may be connected. Give it a try.
Second, if you plug the wiring or no response, it is estimated that the internal hardware loosening of the mainframe, with a screwdriver to open the chassis, and then in the chassis motherboard location to find the location of the memory strip, pull down to try to plug it up. If the computer is a stand-alone graphics card, it will be your independent video card also pulled down, with eraser in the clean gold parts, plug back, and then the computer to reboot to try the computer can work properly. Of course have encountered is hard drive loose condition causes boot, so you can also try to plug the hard drive.