occasionaly when I power up my pc it'll restart itself half way through then its fine after that, Iv got a 550 power suply a 2700k overclocked to 4Ghz a 560ti 5 fans do you think it could be the power suply, or maybe its too cold or something
What kind of power supply? Also, is the OC stable?
The power suply is a OCZ fatality, Iv had the power suply for months and the OC aswell and iv not had problems till about a couple of weeks ago
PSU might be becoming faulty. OCZ is a terrible choice for a PSU (not as bad a DiabloTek, but still bad.) If you have another PSU, try it as long as it's powerful enough.
I recommend going with Seasonic, Corsair, or XFX next time.
check that the 24pin to your main board is secure, also check the pins for your power button/reset button (ruling out the stupid stuff) make sure thats secure. Also test with a different psu to make sure that it's not that OCZ, the fatality series PSU is pretty prime but lots of people are wary of their products.