Hello, I have a PC with Nvidia 6700xl display adapter in my living room using my Sony LCD TV as the display (HDTV 720p). The TV does not have VGA/DVI/HDMI inputs so I have connected it using the component connection. With Windows XP I get perfect picture through the component connection.

Now that Vista SP1 is available I went ahead and installed Vista Ultimate (32bit). During the installation I hooked up another monitor using DVI. The installation went fine, but I have not been able to get Vista to produce picture through the component connection. I immediately installed the latest nvidia drivers I found (174.70) and tried single monitor and dual monitor setups with my TV through component connection as the secondary and primary display but no matter what I do I always get just some lines and dots flashing on the TV screen but no picture. However, when Vista is booting up I do see the BIOS messages and the progress bar moving along on the TV screen so there is picture through the component connection during the boot process. But as soon as Vista has loaded the screen goes black with some lines and dots flashing time to time. If I have dual monitor selected at the same time I have normal picture on the monitor hooked up via DVI.

The system is now in dual boot configuration so that I can still boot to Windows XP as well. When booting to XP the TV still shows perfect 720p picture through the component connection.

I have tried several different nvidia drivers (older versions) but the problem is always the same. Also updated the BIOS on the PC, but no difference. I have also tried lower than 720p HDTV resolutions, but the problem is always the same.

I am running out of ideas... Has anybody had similar problem? Unfortunately I don't have any other display with component connection so I cannot try with another display. The flashing lines and dots make me think that perhaps there is some timing issue with the component signal so the TV is unable to synchronize to the signal for some reason.

Any ideas?