Computer keeps restarting after a couple of seconds

[cramped]

Hey Guys,

About 6 months ago I built up a system for gaming and has worked fine up until now. For no apparent reason when I power on the system the cpu fan spins the harddrive spins and all the aux fans but only for a couple of seconds then it turns off and tries to restart again. If I pull the P4 plug from the board the fans will then start and stay spinning. Im not really sure whats going on but any help would be good before I go out a buy something I dont need.
My specs are:

Gigabyte GA-965P-DQ6 board
Q6600 cpu
Asus 8600 GTX Silent graphics card
2 x 2Gb DDR2 800mhz Patriot Ram
500gb Seagate hdd
and a Sigma 500 watt PSU


Thanks in advance

 

[Matthew DeCarlo]

Just a shot in the dark, but I figure it's better than nothing. Sounds like your PSU may be failing/has failed. Try swapping it out for another and see where you get.

 

[kimsland]

Have a look here: Tutorial: No POST (Power On Self Test

 

[DaMak420]

Check and make sure your heatsink is still securely fastened.

 

[kimsland]

You mean this part, provided in the above link?

Reseating your CPU

Actually, no that's the CPU not the Heatsink. My mistake :/

 

[DaMak420]

lol, i figured there was a section in the no post link you provided kim. Was just giving him something to browse for =P

And yes, that is a link to re-seating the cpu hehe.

 

[kimsland]

Doh ! You found an area I hadn't mentioned
And I like being thorough

Hmm I did mention heat, but that wasn't exactly specifically loose heatsink.

Now I have to think about what to do

 

[DaMak420]

Add a new section of course