Studio Desktop 540, WIN7 64 bit Radeon 4350, no DVI Output

I recently updated the ATI video driver on my Studio Desktop 540 running Windows 7 64 bit using the Update Video Card Drivers in Steam. Big mistake... after I installed the new driver, I lost DVI output and had to pull an old VGA cable and hook it up to my monitor. I uninstalled ATI Catylist and the video driver and installed the Dell version of the Radeon Video driver. I'm still only getting output on the VGA side. Does anybody have any suggestions on how to get video output on the DVI side?