So I just built a custom build last night & got everything up & running..Problem is..Whenever I start doing anything something inside starts a whistling sort of sound. I tried to play Crysis just to test out the power of the PC & after getting through the intro a little bit the whistling gets louder & the PC shuts off for about 3 seconds then turns back on..I tried removing the heatsink & putting it back on thinking it might have been loose or something but that didn't make any difference & of course since it's the 4th I can't really call anywhere to get help either. Anyone have any suggestions?