• Matt: Have you run hardware test (utilities when booting from your OS X disk that came with the Mac)?

    Braker: Your iMac G5 likely has bulged resistors on the main board... if you winge enough Apple may replace the board for you (it was a manufacturing/hardware flaw in the iMac G5 line).

    Regarding your HD, just take it out and destroy it or implant it in a new machine?

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