I have just finished installing Vista Ultimate (64 bit) on my new mac pro, and the screen is really dark, and I can't seem to get it any brighter. My graphics card is the Nvidia 8800gt, I am using an old 23" ACD through the ADC/DVI adaptor. The screen was nice and bright all throughout the installation, but after I installed the boot camp drivers from the Apple install disc, the screen became really dim. If I open the Nvidia control panel and try and change the brightness from there, the screen stays dim, but just gets really washed out. The weird thing is, it translates back onto the OS X side. When I restart after being in Vista, the display is still very dim - I have to go in the Displays system preferences and manually change the brightness back up from minimum. Conversely, when I boot into Vista having been in OS X, the screen is initially bright through all the login screens, but then switches back to being dark as soon as I have logged in. There is probably a really simple solution to this, but as I am completely unfamiliar with Vista, I'm stuffed if I can work it out. Any advice is gratefully received.