You sure you're thinking of the G4 though? I thought I remembered seeing where someone had upgraded one to 2GB in a thread somewhere, but I could just be remembering things that never happened.

Thanks! Best of luck with yours as well! I think it's most likely the CRT. If it means anything, the computer had been unplugged sitting in a closet for years, as the previous owner tells me, so I'm thinking maybe the CRT was "starved" for electricity, so to speak, and that's why it made the noise. Of course I know absolutely zero about the workings of electronics. XD

Yeah... Too bad there's no alternative... Yet?