Macbook pro screen blinks after connecting it to LED Cinema Display

Hello, just bought a 27 LED Cinema Display to connect my macbook pro 17 (early 2009).
Everything fine until today. After disconnecting my laptop to the display the screen of laptop blinks.
Never had this problem.
I would appreciate any help.

...but I need to be sure that my macbook will not stop working if I leave the problem with the screen blinks.
Of course you do — we all need to be sure our machines will keep working properly. Unfortunately, there's never any certainty about that, even if one's machine is working perfectly right now. But if it's any consolation, I've seen nothing posted in these forums to indicate that the blinks commonly foreshadow anything worse, so I think you can be reasonably confident that your machine isn't at the start of a predictable course of deterioration.

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