My PC doesn't turn on

hey..What do I do if my pc doesnt turn on when I press the power button but the power light goes on and after sometime it goes off without powering the Pc??
 
Check if your MB has a hard on/off switch on the board itself. If it has, try pressing that and see if the machine boots. If it does, it's likely just your case on/off switch, or the on/off switch jumper has become detached from its socket on the board.
Also, try switching the PC off at the wall, and leaving it for 20 minutes. Switch back on at the wall and press start - if it boots, then it's almost certainly your PSU.
 
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