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I recently aquired an ASUS M4A78 mobo and it runs perfectly with my ATI HD 5770 but when I toss in a old 6600GT it wont work? No signal on screen from when I turn the computer on.

The 6600GT works perfectly on my other asus evo mobo..

What could be the problem? Would a BIOS update on the M4A78 help?

Thanks alot!