> > My firmware is 4.1.9, which I think is up-to-date, right? yep. > As far as RAM, not only did it pass all the tests, but I've tried with: > > - The original 64MB chip only > - A Kensington 512MB chip only > - Both > > All with the same results. Do you still think I should buy a third RAM > chip and try that? > I'd be tempted to try with another chip - maybe borrow one, or buy another to use in any case. I don't think 64 MB is enough to run OS X, so that's not conclusive . It could still be the hardware, though..... keep us posted, Marty