DVI video out suddenly not working.

That's basically it. I have a 23-inch Cinema HD Display at home and at the the office. Suddenly the video out is not working with either of them. The displays control panel lists the external display, so the system is detecting the connected display.
There is nothing wrong with the displays. I connected an old PowerBook and they light up fine. With my MBP, the power light lights, but nothing is displayed on the Screen.

there's a somewhat similar thread "external monitor stopped working" with no answers
my 17" Studio display works as 2nd mon on other computers
my dvi out does work with a vga monitor and adapter, of course :))
i'm using the dvi to adc adapter -- could this be involved somehow?
my laptop display goes blue when i plug in the external monitor as it should, but the 2nd monitor never wakes up, turns on, etc.

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