I was having a weird problem with my screen going black at random after installing any version of Vista, and kept having to force a restart because there was no way to get the screen to come back on. I searched all the forums and it seemed to be very common, but as with most of the forums everyone was argueing about how to fix the problem instead of helping the people with the problem. So I'm posting this one in the hope that it may just help one or two people with the same problem.
My remedy was simply to update the BIOS to the latest version P32 I think from the XFX website, and the problem was no more, I also updated the High def audio driver from the same site, now my machine has been running flawlessly for three days now.
