Hey ElDiabloConCaca- thanks for your response, it's so absolutely nice to have total strangers who are willing to help on these daunting computer problems!
Since you're being so kind I'd like to ask ya more:
I plan to run a disk repair program that a friend turned me on to, to see if that stops the crashing, does that seem reasonable?
After that I see no other option than to pack it up and run it up the street to the Apple Store.
I've already created more problems than the original freezing-plaid-static-screen, since I reloaded the 2 software disks that came with my iMac G5.
Turns out, since I upgraded my Panther operating system (via the internet) to a mere decimal point or two higher and then reloaded the 2 software disks that changed it back to the original lower version a new problem happens: Safari and Photoshop will open but the window will not open for either.
I found out on the apple support web site that it was indeed the cause, and the remedy would be to upgrade Panther via internet, yet again.
So- when I tried to remedy my new secondary problem by reloading the newer version of the Panther internet update, I seemed to have trouble getting it. It seemed to be progressing slowly but surely as I saw it say 80% complete and so on...I came back after 8 hours to see the blue scroll bar back to the beginning and the percentage info gone. I suppose I should try again- but I had to give up on it at that point as I needed the phone line.
I'm sorry, I guess I'm practically ranting at this point.