component outs work

Hey all.. Enjoying the beta2 of the 64bit version. Still new, day 3 now.. Have a problem..
Noticed there are widescreen backgrounds, and thought, hey, lemme turn on the HDTV that's hooked up to this rig and check em out! Low and behold, no TV option. Downloaded the latest nvidia drivers (have a 7800GTX), think they are 88.61, rebooted, and now, it won't even boot. (does the loading bar and once it's done screens both flicker (LCD and the HDTV) once, and just stay black. Now.. If I turn off the TV, and hardware reset it(switch), Vista loads right back up like nothing ever happened. According to the nvidia PDF file, tvouts should be working fine, and I can't seem to find anyone else with this issue.. Any ideas on what's going on? Thanks for your time,
Rooster