Some weird problem here.

[padderay]

I've just built a rig recently but am encountering some weird problem.

I'm unable to turn on the computer if I leave the main power supply off for a long period of time ( > 4hrs). [On-board power switch does not work too]. If it's over a short period of time like just shutting down and power up after 5 mins, it's fine.

However, if i fiddle with the cables/PSU long enough, miraculously there'll be power to the mobo and it'll start.

Any idea what's causing the problem? Faulty PSU?

Hardware:
PSU - Seasonic M12ii 750w
Mobo - Asus Z87 Pro

 

[localITguy]

test your PSU with a paperclip

 

[padderay]

hmmm. But the PSU starts. What other problem can it be? Mobo pins?