Serious issues with iMac, black screen during erase and install-PLEASE HELP

My sister's Intel iMac G5 seriously has been a lemon, it has had SO many issues. It's now 2 years old, and has been rather slow for the maybe the last year, but over the last month or so it has gone way downhill, and it literally takes an hour to boot up, and 4-5 minutes to do anything (open an application, look at a photo in iPhoto, etc.). So, we've been trying to "erase and install" with her install discs to hopefully give the computer a clean boot and see if it helps at all. She has already backed everything up.
She started the erase and install last night, and it was going ridiculously slow. This morning when she woke up, the blue progress bar had gone about half way across. Then she went to get her kids ready, and when she came back in it looked like the computer was rebooting itself (gray screen with apple), but then the screen turned black and she can't do anything on it. Has anyone seen anything similar to this before?
We have had so much trouble getting this to work (we tried an archive and install a few days ago, but it gave her an error at the end). For about a day we couldn't even get the computer to boot up at all, but then miraculously yesterday morning it booted! Please help, I've converted her to Macs but if I can't get hers fixed she may never get one again!!

I'm afraid that it's a contradiction in terms to talk about an intel iMac G5. What your sister has is an intel machine, and she will find good advice by posting to the [intel iMac Forum|http://discussions.apple.com/forum.jspa?forumID=1110].

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