Black Screen on Boot using mac pro os snowleopard 10.6.6

I get a black screen on booting my macpro with os 10.6.6 after the booting is done the screen activates automatic. i do hear the startup sound but dont get the startup screen with the apple logo.
also my mouse does strange things like not responding on a mouseover juming around the screen and pressing buttons i don't press. Never had these problems before until this morning whenn i booted my mac pro. Please help

Could be your monitor power supply is going. could also be 10.6.6 so first try to get back to a OSX which did not give you problems.

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