I have a G4 Rev. D 15 inch PowerBook with 1.5 GB of RAM.
A couple of days ago my computer seemed slow so I checked my RAM and it says I only have 1GB. I have a 1GB and a 512MB combination. It's worked fine for a year and a half until now. I switched the RAM around and it says I only have 512MB. Anyone know what's wrong? I don't have AppleCare and my warranty ran out.