I can't take it anymore. Every game i try cause my pc to crash and the monitor to lose signal. I replaced the mobo, switched videocards, checked ram and checked the hdd and i still get the same problem. Someone help

. The psu is an apevia iceberg 680 watts and my main video card is an 8800 gs. Mobo is a brand new gigabyte and im using a intel e2180 cpu