Problem :  How to solve when the computer would not turned ON?

Sulution:             

This can be a computer user's worst nightmare. You hit the power button and nothing happens. Any number of things can cause this computer problem — it may be something as simple as a loose cord, or as serious as a dead power supply.

Another common PC problem is when the computer turns on and the fan and lights come on, but the machine doesn't boot, or shows a blank screen. This could be anything from a dead (or unplugged) monitor to a dead hard drive or corrupted boot sector.