Power Mac G4 from 2005...still going strong. I've replaced the battery a couple of times though. My primary computer, however, is a 2010 MacBook Pro...it's a lot easier to open and repair than the G4. First one I used was a Commodore PET at work...no hard drive, no disc drive...and it took at least 5 minutes to save anything to the external tape drive. More a novelty than useful.