Intel aluminum imac problem

Hi,
-My 20" imac is 2 years old
When I start the my computer, the top of the screen (half) become dark (the brightness).
I've search on the web and I read it was the backlite. I don't think it's that because before being dark, the brightness is ok...
Here's a video
http://www.youtube.com/watch?v=VPJhcBhA6GM

Try resetting PRAM
http://support.apple.com/kb/HT1379
and if that does not help, disconnect the iMac from power and reconnect it using the reset SMC procedure
http://support.apple.com/kb/HT1543
When you reconnect it, try connecting it directly to a wall outlet by itself initially, and do not connect any peripheral devices except for your standard USB keyboard/mouse. See if that has any positive effect.

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