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It is a G5...though one I bought used. Will try calling, in manner advised. Re: PRAM zaps and NVRAM resets. How to...? Thanks again.

Thanks. Just tried DVD boot. No change. Graphics card sounds right. Is that fixable? Forums say things like: "Can't change graphics card...they are soldered onto the motherboard."

Stepped away from my iMac, returned, and here's what it looks like now: http://www.wheretheclientis.com/wp-content/uploads/2010/07/imac-problem.jpg Rebooting no help. Looks like the machine's functioning, but the screen has turned to rows of tiny black and white boxes. What's going...