Extended monitor problem after upgrade from Snow Leopard

Upon upgrading Mac Pro (09) from Snow Leopard, I can only get a black screen on my extended desktop monitor.  I can see the mouse cursor, but nothing else.  I am not using Full Screen.  Any suggestions? The extended monitor is a SyncMaster 943. thanks.

After reading about kernel panics on this machine, I should also report that the MacPro has two Nvidia GT120's.  I have not upgraded the driver manually and have not had a kernel panic (yet).  Just the black screen on actually two extended desktop monitors.

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