Computer wont boot after shutdown!

[Quoc Huy]

Hello,
I have problem with many Dell Vostro 460 computers in my company.
When i plug in the power cable, the computer start by itself and work normally even after i restart.
But when i shutdown, it will not boot again when i press power button, cpu fan not working, power supply fan too, nothing happen. The green led behind the power supply is still on. When i unplug the power cable and leave it for about 2 hours then plug in it will work again.

My spec:
CPU: i5-2400
RAM: 4GB
HDD: 500GB
PSU: DELL 350W
VGA: GTX650

Thanks in advanced.
P/S: sorry for my bad english.

 

[BrandonYoung]

Is your power button broken in the "Closed" position?

 

[Quoc Huy]

I dont think so. I also tried to connect front panel power pins directly but still not working.

 

[BrandonYoung]

This could represent an issue with either the PSU or the Motherboard.

 

[Quoc Huy]

Thanks Brandon,
I'll send them to dell services warranty center for further check.