My display starts "buzzing" when I increase brightness.

My display starts "buzzing" when I increase brightness, but gets lower decreasing lights. It seems to be originated in the left down corner on the back side.
It sounds like an electrical short circuit. Shall be needed assistance?

Actually, Apple says to use the Disk Utility program on the installed system to "Repair Permissions" as the program uses a database that is updated to the proper settings for the version of 10.6 that you are using.
The original DVD may have 10.6.0 on it but the computer may be running 10.6.2
The original DVD doesn't have any changes in the permissions that Apple has included with updates.
http://support.apple.com/kb/HT1452
There is also an Apple document that says that just about every warning you see in the window while doing the repairs should be ignored. I just uncheck the details box and wait for the "Permissions Repair Complete" statement to appear.
http://support.apple.com/kb/TS1448
I don't know if a permissions issue is causing the video settings issue, but it can't hurt to run the program.
Zapping The Pram is also a powerful reset mechanism you can try.
http://support.apple.com/kb/HT1379

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