Thats really quite interesting, equill. Yes, i am still using the original transparent Apple power cable with it. I might have to have a look at the plug and check that its in good condition. Just like yours, mine is a 9.2.2/10.2.8 machine. Either way, thank you for the advice, definitely something that I'll check out, and that I never thought of before.

For the record - you've had your iMac 500 since 1983? Wow, must have been a *really* early prototype! Did you get it from these guys by any chance?