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it doesn't sound like a virus to me, so I wouldn't worry about that yet at all. I don't know of any viruses for Os X, and even if this was Os 8 or 9, I don't remember any viruses there doing anything like this.
I would guess a video card or power supply problem, or ram, or other hardware problem. So I would boot from the hardware test disk and try that, and they boot from a disk and see how it runs that way.
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My guess: video card is near death. Time to junk the eMac.
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have you tried rebuilding the desktop?
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Assuming some version of OS X is on it:
You can Repair Disk by booting into Safe Mode. Just hold the Shift key immediately after hearing the startup sound. Hold it there for a minute or two at most. That will repair the disk during the boot process. It takes a loooooooong time, but you eventually see the Login window. Select Restart, and it will restart normally.
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Bad capacitors.
Not worth trying to fix at this point.
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Thanks for the replies. I think this one is going to the great gig in the sky.
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Bill in NC wrote:
Bad capacitors.
Not worth trying to fix at this point.
Yeah, that was the problem my mom's eMac had. We got it fixed so long ago I'd forgotten the exact nature of the problem.
I agree that it's probably time to give it a proper burial.