GTx 260 Sli Problems

I just get constant lock ups....Mostly when i run any 3D application or watch videos or at the " WELCOME " screen when windows is starting.
At times they work but afterwords they lock up.
I've done everything you could think of for trouble shooting. And I cant figure it out. Is it a BAD Card? Or BAD Psu? a BAD Mobo...?

I can have both cards in the computer but if i ENABLE SLi it locks up. So their both connected and still locks up.... Tried them alone and i still cant play games..

My specs are the following-

GPU: GTX 260 55nm 216 x2
MB: MSI NF 750 G55 ( Latest Bios )
RAM: Corsair XMS3 1333 MHz DDR3 4Gb Ram
OS : Windows 7 Home Premium 64bit.
HDD: 300GB 7200RPM Western Digital
CPU: Amd Phenom 2 x4 955 BE @ stock Clock 3.20 GHz
PSU: Antec Earthwatts 650 Watt
Case: Antec 900 2 with normal Fans
Disc Drive: LITE ON DVD Burner
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  1. This is your third thread on the same subject, try and stick to just one please.
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