Monitor showing static and blinking after 10.6.7 update

I have a MacBook unibody 13 inches attached to a Cinema Display. After I completed the upgrade to 10.6.7 the monitor now shows static and/or blinks randomly. It is difficult to replicate the problem, as it happens at very random intervals of time (sometimes a day goes by without it happening). Is anybody else experiencing the same problem?

The first thing i would usually try with a display issue is on the Macbook try resetting the Parameter RAM (http://support.apple.com/kb/ht1379) to help the graphics cards communicate with the external display.
If it's still happening it might be the connection or the actual Cinema Display so Thomas' questions are definitely a good next step.

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