Sometimes dead on DVI

For the past couple of days my Intel Mini has been exhibiting some odd behavior. When I wake it from sleep, the monitor will spring back to life for a moment and then go back into "sleep mode". I will try playing with the plugs, wiggling the mouse and touching keys on the keyboard, and even restarting the Mini using the power button, but nothing works. The first time the DVI connection died, it went out for 12 hours. Later in the same day, it went out again, so I turned to Google for help. I found a user at Accelerate Your Mac who said he had spotty DVI and ended up using the VGA adapter. So I dug up my DVI-VGA adapter and tried that, and to my suprise it worked (my LCD monitor has multiple inputs). For some reason it turned on with a strange resolution in the 1300x700 range or something; my LCD monitor's native resolution is 1680x1050. I set the monitor to 1680x1050 in VGA mode, then switched to DVI and it worked. I did a fresh reinstall with updates just a week or two ago, so I don't think it's an OS problem. I tested my monitor and it's not a DVI connection problem on that end. Anyone heard of this?