Running 15" PB G4 1.5ghz 512 ram 80gig 4200rpm drive OSX 10.4.8. About 1.5 years old. In the last week, I have noticed memory totally depleted when running one or two programs. I checked, and when I reboot, even with no programs running, i have between 5 and 10 meg of ram free. I have tried removing all icons from the dock and disabling Dashboard, but no luck. Clearly something is up, and I think it might be my hard drive wearing out and forcing the RAM to do more work.