Almost sad the newest buy, an iMac G4 15" is fully equipped (2 GB RAM, and sufficient disk space) so I have nothing to upgrade. (Maybe an overclocking to 1,25 GHz later. Remains cleaning and minor maintenance: 1. The upper articulation (behind the flat panel) of the arm is a bit loose, the screen does not stay vertically. Do I need some special tool for the 3 holes on it? 2. The screen itself has some light scratches. Can I replace the foil with one from a nonworking 15" laptopo?