My 20 Cinema display won't show up after years of pairing perfectly. How do I get it to show up?

I just plugged my cinema display into my MBP13 and I cannot see it. I disconnect and reconnent the display when I travel, and it has worked for years.
In system preferences underr display it does not show up. I tried booting from a differenct drive and it shows up just fine. Unfortunately I don't want to work from a remote USB drive. I've run disk utility just in case there was a permissions issue. I've disconnected and reconnected the DVI adapter as well as display port connection. I've also simply restarted a couple of times. Any ideas about how to get this to work? I know the display is fine because I can see it when I boot from an alternate drive. I don't get it. Please help!!!

Hi s2pid,
Thanks for visiting Apple Support Communities.
You may find some of the other troubleshooting steps in this article helpful:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573
All the best,
Jeremy

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Message was edited by: gotomike

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When the LED is "On", the display is "Off".
http://docs.info.apple.com/article.html?artnum=301944
You are sure that no flashing is occurring?
http://docs.info.apple.com/article.html?artnum=88366
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http://docs.info.apple.com/article.html?artnum=2238
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http://docs.info.apple.com/article.html?artnum=86760
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-Tip: The Shift key should be held as soon as possible after the startup tone but not before.
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http://docs.info.apple.com/article.html?artnum=106388
Does video display when booting from OS X install disk?
http://docs.info.apple.com/article.html?artnum=300537
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My 20 Cinema display won't show up after years of pairing perfectly. How do I get it to show up?

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