I have a MacBook Pro with an NVidia GT 330M graphics board and mini display port output.
I purchased an HDMI converter for the computer, and connected it to my TV (Panasonic GT30). When booted in OSX, the TV displays the image correctly.
However when booting in bootcamp, there is no image on the TV, it's just black. The display drivers can see that a Panasonic TV is connected, and I can select from the possible display resolutions, but the monitor just remains black.
I downloaded and installed the NVidia reference drivers (don't know if it was a bad idea, but one of the points was to be able to display stereoscopic 3D).
Why is the monitor black?
Edit: I tried connecting to an older Sony TV. Same result, the NVidia drivers can detect that a Sony TV is connected, but the TV is black. I also tried selecting different resolutions and refresh rates, no luck there either.
The bootcamp install is running Windows 7 64bit