My normal setup is my monitor, connected via an analog VGA output from the mobo. I use the mobo's HDMI port to run to my HDTV for occasional home-theater (using a dual display).
I had a stab at overclocking, and got a stable OC. The analog VGA crapped out, which I was prepared for, so I switched to a DVI cable. Hunky-dory. Then I discovered I can't do dual-display with DVI and HDMI.
I returned to default clocking (including the VGA clock) through the BIOS. Now, though, I can't get the monitor to detect either HDMI or VGA inputs. Not through the monitor's built-in detection, not through the AMD VISION engine on Windows. I've tried the cables singly from restart and in combos. DVI is now the only output.