I put a new PC together this week end . Powered it up Bios came up for about 1 min. Then the PC turns off. not sure what to do. EVGA 680i MOBO ,Intel Q6600 ,EVGA 800GTX, OCZ 4 GB ram TL 750W PS.
I had a similar problem & found out it was the heatsink, My problem was that the heatsink was no longer in full contact with cpu as it was loose & needed adjustment.
Yes, it'll either be the CPU heatsink or the power supply most likely. Which brand is the power supply? I can't think what TL stands for.