Upon restarting my computer (which runs OSX 10.6.8), one of my 23 inch Cinema Displays is flickering like crazy.   Please help!!!

I use two 23" apple cinemas displays with my MacPro.  Several times in the past, when I've restarted the computer one of the monitor is flickering as soon as it powers up.  One of those times I shut the computer down again right away and restarted and the problem went away.  Another time it stopped after sitting for a while.  But it has just happened again....and this time, no matter how often I restart, or how long I've let it sit, the monitor continues to flicker.  Any suggestions would be greatly appreciated. 

Hey SGOWriter1,
I found a document that can help with external display issues. I would concentrate on the troubleshooting steps in the "No video or no signal, image distortion, "snow," or flickering" section:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573#1
Have a good one,
Delgadoh

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