I got a Gigabyte GTX 275 with my new build a week ago and since day one I get no signal during post at most of the times.
When I do a cold boot, usually I do get a signal and the display powers up, but when I do a restart from windows, almost always there is no signal up until the windows login screen.
This is not a drivers issue because it occurs only during post, but works fine in windows.
It seems that a lot of ppl got the same issue, here is just one of the ongoing discussions:
Gigabyte UD GTX275 Screen Detection issuesAny ideas?