I had a similar problem when upgrading from ME to XP. ME would always default to whatever I had plugged in, whether it was composite or VGA. When I Upped to XP, it would default to VGA. I had to plug in both a TV and monitor at the same, then set it to composite only in windows, then shutdown and pulled my monitor off, then powered back up with composite only. Then it worked. I dunno how you're gonna fix it though if your composite is greyed out, unless you didn't have anything plugged into it when you were trying to switch. That's the only thing I can think of.