IMac Dark Area Left Side Screen

Worked late couple of nights ago - watched the left side of the screen go darker. Turned the iMac off for 15 minutes - and the screen was okay again.
Till today... the dark area - left side of screen - turned up again. Disappeared again for 5-10 seconds and the problem reoccured.
The iMac is cold at the bottom of the screen but pretty hot in the top... wondered if it has something to do with the heat generated.
Often happens when iMac is turned on for several hours.
Any ideas?
The iMac is from fall 2009.

Greetings,
Sounds like the backlight behind the LCD is going out.
Reset the SMC and then test: http://support.apple.com/kb/HT3964
Reset the PRAM and then test: http://docs.info.apple.com/article.html?path=Mac/10.6/en/26871.html
If the issue persists after you follow the above steps you are experiencing a hardware issue and your system requires evaluation and / or service. You may wish to make an appointment with a Mac Genius at an Apple store, contact AppleCare via phone, or contact an Apple Authorized Service Provider for assistance.

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