It could be dozens of reasons. I'll throw 2 more...
Make sure the MB isn't grounding out on the case. AKA extra stand off pins
Connectors all plugged in correctly that control the ON button, Reset, LED lights, etc?
That's the most common cause
Malo periculosam libertatem quam quietum servitium
Last edited by JonJon; 10-05-2012 at 11:49 AM.