What Causes computer black screen

Analysis of the cause: Is it a virus? No, I haven't heard of any virus that shuts down the machine! So again on the boot, watch the change, this time the discovery of the host did not alarm sound, power fan normal, CPU fan is normal, that is how to return? In the absence of any other means, to borrow a computer to a friend, The replacement Falay are used to check individually. The first to be checked is the graphics card, because the black screen, but the new video card boot or the same as the old, excluding graphics factors. By the way, isn't it possible to shut down the host power? Could it be a power problem? So then replace the power supply, did not find any problems! Would that be often caused by power outages that drive the "dead"? Yes, it's possible. So immediately remove your hard drive and plug it into another good hard drive. The power switch can be pressed or not responding. Alas, I have to go on one thing at a change. Even a few jumpers on the motherboard have not been spared, pull down and plug in a plug. Even the last glimmer of hope was dashed because of the faulty jumper contact.

Find the root cause: It's a little crazy, this kid's shoes really want to throw the machine to forget. No way, turn off the computer and think about it? Listless press the power switch, did not expect "beep" to a sound broke the silence of the late night, the computer and self-test started! I stayed and watched it slowly start, as if there was no problem. What's going on? A look at the hand, the original I press the power off when the wrong, pressed on the Reset key! How did the computer start? A look at "Reset" button, the above paint has been off. Note that this button by a lot of times, just "reset" button down, so that the computer has been in a reset state, no wonder it can not start! If I accidentally pressed this button, anyway will not think of, finally the computer has "live" over, I can be relieved.