I have a G4MDD that has start up issues. When I push the start up button, nothing happens. If I pull the power plug then reconnect it, the computer will start using the start up button on the front, but I noticed the start up chime is different (like older G4's) and the big fan doesn't start. Also icons in the dock don't bounce. If I then restart using the apple menu, the normal chime comes on, icons react normally, but the big fan still doesn't work. Just had the big fan replaced so I wondering if I have bigger issues lurking.