Wondering if anyone could help me troubleshoot a weird problem that just happened. Fired up my computer yesterday, everything normal, tried to play an mpeg file I've played 20 times before, got great audio but no video!?!? Just a black screen. Have tried using every media player I have - WMP 10, Nero, Creative, Quicktime - all the same. It's the same story with other video file formats as well - avi, asf, wmv - all of them. The strange thing is everything else works fine and I haven't made any changes to the system other than routine maintenance. Any ideas how to troubleshoot? Possibly relevant specs (home built) - Win XP Pro (no SP2), Powercolor 9800 XT very moderately oc'd (tried cutting back oc already - no help), latest Catalyst 4.10 drivers, P4 3.0 Prescott oc'd to 3.64 (very stable, have run Prime 95 for 36 hrs with no errors), NEC Multisync FP2141 22" CRT 1600x1200 @85Mhz. I'm at a loss as to how to attack this because everything else is working fine and it just happened out of the blue. Went back a couple of System Restore points and that didn't help either. WTF??? Thanks in advance.