So my dad decided to upgrade the ram on his Powerbook G4 to 2GB. Initially everything went smoothly and the ram was detected and working. Within a week though, the computer only recognized 1 of the memory slots. Switching the ram cards around proved that the ram itself was fine but that the one memory bank was not working. So I ask you all, is this at all a common problem with the Powerbook G4? And what would you recommend we do about it. Our concern is that a repair may cost more than it is worth considering this is an old machine.