I have had a similar problem with a 4.4 Omega drivers and my Radeon
9600 Pro. The 4.4 drivers seem to cause my monitor to lose the video
signal and go into sleep mode randomly. This happens both in 2-D and
3-D modes. Switching back to the 4.3 Omega drivers fixes the problem.

I tried enabling and disabling fast writes, but it didn't seem to have
any effect.

David