Problem with powering PC

[gnc]

1. When press power button PC has power and starts checking as typical: HD and other drives, but than hangs and won’t boot and monitor is not turned on (no any beeps as indication).

2. If press power button for 5 seconds (to turn off) and power again everything is fine.

Mostly that’s procedure, but sometimes I have to click power button 6-7 times.

I have tried with different HD, Video card, memory, but problem still exists.

Specification:
HP workstation XW8000
CPU 2 x 3.0 GHz Intel Xeon
2 x 512 RAM 2100
HD 320 MB

 

[engiNURD]

Did you try another PSU?

 

[Lamont Cranston]

My Guess would be mother board, but if its under warranty give HP a call and make them fix it