My mate just brought a new pc in parts and i put it together for him but we are having a little trouble with the video card.
For some reason the DVI monitor no longer works (same monitor will work using the VGA instead) there doesnt seem to be any setting for this, the video card control panel doesnt even detect the display when using the DVI but the Device manager does.

Have tried reinstalling the drivers and downloading new ones from the net but no luck.
Am using a Sapphire 3850 256mb, windows vista ultimate, gigabyte ga-ep31-ds3L

The problem may have coincided with the installation of a hauppage nova t500.