My computer does turn on when it feels good...

[blackwinterday]

Hello,

I have a weird problem with my pc. When i wanted to switch it on it doesn't. I'm switching off my psu, unplug and replug power cable and try again. Sometimes it is turning on sometimes isn't. I've tried to unplug keyboard cable (ps/2) and replug when it insisted not to turn on and it worked. I have no idea what it has to do with keyboard. Do you have any?

 

[jerreddredd]

there maybe a setting in the BIOS for power on via keyboard.

case power switch could also be faulty. you could momentarily jumper the power terminal at the mobo to see if it is faulty or not.
Step 8
http://www.computer-how-to-guide.com/motherboard-troubleshooting/motherboard-post-test-how-to/

 

[blackwinterday]

Best answer selected by blackwinterday.