I've confirmed on another computer that my monitor works. The DVI cable works. My Mac Pro does successfully boot up (I hear the start-up chime, as well as the Gmail "new email" notification chime).
But I can't get an actual screen to show up on my monitor.
I have two video cards (ATI Radeons, Apple issued. 4 DVI slots total). I've tried each slot. No dice.
Any troubleshooting suggestions?
My setup was working just fine when I last put my computer to sleep. Stopped working when I woke it up.