Mid 2010 Mac Pro, Black Screen on start up.  Video works after I turn machine off, let it cool

My Mac Pro is acting up.
If I do a reset after its beenruning for a period of time I get a black screen at start up.  I have tried multiple different monitor cables and nothing seems to work.  It does seem to resart and I can here the start up chime but no display.  If I unplug the machine and let cool for 1/2 ~ 1 hour it then turns back on with no problem.
Processor  3.33 GHz 6-Core Intel Xeon
Memory  24 GB 1333 MHz DDR3 ECC
Graphics  ATI Radeon HD 5870 1024 MB
Software  Mac OS X Lion 10.7.4 (11E53)
Display is the 27 inch cinema
Any ideas?  Bad graphics card?

AC if you used it this once would pay for itself. Same for a good solid UPS - a good one can stop that 1/100,000 surge that takes out a modem (if you filter of course).
I've known people that never knew you could filter coax cable or dsl and we get enough severe storms it has been, not if it happens, but when.
Unlike the X1900 which had a air chamber and would cause clogging you really should not need to and be pulling it out to clean dust all that much if at all.
People have gone through 2 or 3 ATI 5770s and some 5870s due to what are probably design or bad batches especially the first months run.

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