gtx 670's refuse to work in SLI

Hi and thanks before hand for any help. I have 2 gtx 670's that since a bios flash refuse to run in SLI I have since reflashed them back to the original bios still they refuse. I have tried changing the SLI bridge, changing card slots, and using old and new drivers nothing seems to work each card on its own works fine one is the galaxy single fan GC model the other is the MSI reference card. my rig is the one listed in my specs but ill post it here.



Mobo - P8P67PRO

Cpu - i7 3770k

Ram - corsair vengeance 2133

Psu - thermaltake smart M series 850w



O and when I try to open a game like crisis 3 for example I get this little window that pops up and says

DXGI_ERROR_DEVICE_REMOVED :bang:



thanks again for any help

gtx 670's refuse to work in SLI