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M4300 screen won't dim


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I got an M4300 off of eBay for super-cheap. It's got the T8300 2.4GHz chip, 4GB of RAM, a 250GB hard drive, the Quadro FX 360M, and a 1920x1200 display. Everything works - everything - except for brightness options. I can't lower the brightness and it will not dim itself. Instead, the image on the screen "freezes" (only to come back to life when I move the mouse). The screen doesn't sleep at all, though it does go out once the computer puts itself to sleep. I searched the forum and searched insanelymac and came up empty. Nobody else seems to be dealing with this. Any suggestions?

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