Thanks for the interest. I have an asus MB p6t deluxe v2 with new install of win 7 64 bit. Intel i7 950 processor 6 gb ram, Ati Radeon 5770 video card. All updates were installed. I am to the point now that every time I turn on pc I only get desktop image nothing else. But what is happening it seems is that after about 10 or 15 mins it all comes back and stays.
It sounds like you might have a peripheral device plugged in that is causing this to happen..

Do you have a webcam, mic or gaming controller plugged in by any chance? If so, unplug them and see if it makes a difference at all..

Please report back and let us know how you made out..
Just out of curiousity, which version of the ATI Catalyst drivers do you have...