Mac Pro won't send monitor signal

Was checking my email and a Word doc, when I got the grey screen of death... that one that comes down like a windowshade and tell you to re-start.
When I restarted, get no monitor signal out of either DVI. I think it's booting up, but my Cinema Display is totally black, with LED flashing 3 short flashes. I also tried hooking it up to an older Studio Display... still a dark screen.
I was able to use another Mac to look at my HD in targeted disk mode... it seemed OK.
Re-set PRAM and SMC, but no luck.
Any quick fixes I'm missing here... or is my graphics card shot?

Does it do the same thing if you try to boot from the system installation disk? If so, then you probably have a hardware problem. What you experienced was a kernel panic, and those are more likely to be caused by a logic board or CPU problem rather than a display adapter failure, though there's no way for me to be sure what component might have failed. If it won't work from the system installer disk either, then you'll have to get the system in for servicing, most likely. You can try reseating the RAM and display card and see if that makes any difference.
Good luck.

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Mac Pro won't send monitor signal

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