Cinema display problems

For no reason apparent to me my display flickers for a flash and will not display the usual start up imagery.
I've gone through so many help threads but can find no parallel problem.
When I open the MacBook the image on the laptop only shows when I unplug the thunderbolt wire/connection.
Any wiring and plugging with restarts, etc provide no solution.
I did a software update to see if this would help. Problem seemed to correct itself.
I shut my system down and few hours later started up my system again for routine work and same problem occurs.
Does anyone have any idea??
Appreciate help for this ludite.
Ed

Hi, I don't have that Monitor to test, but I wonder if this would help...
http://www.versiontracker.com/dyn/moreinfo/macos/4340
Semi interesting thread on the 20'' and OS9...
http://forums.macosxhints.com/archive/index.php/t-10091.html
Oh, does it boot to 640*480 with Extensions off?

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    Message was edited by: EZ Jim
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    @ Hatter
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