I'm not sure what the issue is, but my 20" iMac G5 PowerPC is running so hot and smelling very "electrical". I took the case off the back of it, and it seems where the G5 metal portion (not sure what it's called) is the source of all the heat. I can't really put my finger on it for more than a couple seconds because it's so hot. Some recent things I've done was lube the fan, and replaced the RAM. I got the RAM per the Crucial ram identifier program that runs on the computer and lets you know which type to purchase. The first batch Crucial sent was giving me about 5 kernel panics within the first week I got it. I sent that back. I received the new one, and it seemed to be no problem in terms of performance at least up until today. I'm not sure what this can be related to. All I really did was while the RAM was out was dust off the internals and clean it up. I don't think I really messed with anything, which makes me think this might be a RAM issue. Until I changed the RAM everything was fine with the computer with no prior problems.