Cinema Display goes to sleep after connection to MacBook Pro.

Hi, I've been using my 21" Cinema Display from my old G5 as the monitor for my new MacBook Pro. I used a Mini DisplayPort to DVI Adaptor to connect it to the MacBook Pro, and it has worked very well - until today.
Now, as soon as I turn the MacPro on (and quickly shut the lid as usual) the cinema display comes up and then - goes to sleep. And I cannot wake it up! If I open the MacPro, both monitors come up. However I'd really like to use just one monitor, the cinema display. What has happened ? I don't think I changed a thing.
Hope someone can help?
Thanks

Have you (perhaps unknowingly) got one of the screen corners set to put the screen to sleep in Exposé. System Preferences>Exposé & Spaces.
You normally have to deliberately point the mouse to the corner to sleep the screen (if active corners have been set up) perhaps if the mouse is left just hovering near an active screen corner maybe the slightest of movements is triggering the screen to sleep. Worth a look.

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Cinema Display goes to sleep after connection to MacBook Pro.

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