My PC has a mind of its own

[kgarnettps]

I am trying to start up my computer and every time i turn it on it starts up for like 3 seconds, then turns off then trys to start it self again. What is wrong with my pc and how can i fix it?

 

[Technochicken]

Could you give some more details? The brand, model number, specs, ext. It sounds like a motherboard problem to me, but more info would be helpful.

 

[Zilliak]

SOUDNS LIKE a PSU dieing my Hp computer did that, or it could be RAM, OR thats ussually it