I'm running Windows 7 RC 64 bit with a Sapphire Radeon HD 4850 512MB, which has DVI and VGA ports. I've successfully used either output to drive an LG L204WT monitor. I just purchased an ASUS VH226H. When I hook the ASUS up to the DVI port, it displays as Windows boots up, but but when Windows gets to displaying the desktop, it goes black and says "No DVI signal". The ASUS comes up fine on the VGA port. Does anyone have any thoughts as to why the ASUS won't run on the DVI port?