Mac Pro intermediate black screen at boot after installing mountain lion

I have a 2008 Mac Pro tower, but since installing Mountain Lion I now get a random black screen at boot. Unplugging the apple cinema 20' power supply for 15 minutes seems to clear the fault. Have had no such problems with other OS until Mountain Lion, seems OK when booting to Snow Lepoard on my other drive?
Anyone have the same fault?

Thanks for trying the help! I tried every version of start up, but with no screen it was no good..
Finally solved the problem, it was the ATI HD 2600 XT graphics card that was dying a very slow death.
Replaced it this morning with a GT120 Nvidia.
Anyone with this card should Google it, as apple did a big recall on these..
http://www.itproportal.com/2011/02/21/apple-extends-warranty-mac-pro-video-cards /

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