Imac Display flickering between brightness?

Hi guys,
My imac 11,2 Intel icore3. Is starting to flicker???
It changes between brightness levels dark/light dark/light?? Doesn't go black, just changes contrast levels.
I do not have the setting to adjust brightness automatically. Just the one, before it goes to sleep, and its unchecked. And still decides to flicker at random times?
Please help,

Contact Apple Service, iMac Service or Apple's Express Lane. Do note that if you have AppleCare's protection plan and you're within 50 miles (80 KM) of an Apple repair station, you're eligible for onsite repair since yours is a desktop machine.

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Imac display flickerring

Im having a imac, its having a problem with the display..It used to flickker .. I got to know the solution for that, but i couldnt get how to fix it..
I just turn the imac upside down and started , works perfectly.. but when i turned it to normal position it used to flickker... I want to know how to fix the problem!!!!! Please HELP ME !!!!

Hi Jeff,
Thanks for visiting Apple Support Communities.
See this article for some information and tips that can help resolve the behavior you're seeing:
Mac OS X: Why your Mac might not sleep or stay in sleep mode
http://support.apple.com/kb/ht1776
Best,
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Message was edited by: geekboy2000 - corrected OS

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Message was edited by: nachdenki

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Imac Display flickering between brightness?

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