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I've had my 20" iMac G5 for about a month now. It's been working great until last night when I started having a display problem. The upper half of the screen dims by about 30-40%. The bottom half stays fine.

I have to shutdown, wait a few minutes, and restart to get the screen back to normal. It happens every few hours. I'm wondering if this is an overheating problem due to the design.

Anyone else experience this yet? I'm hoping warranty service on this doesn't take too long.
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