First of all... Powerbook 15" SD 1.5GHz G4 768MB RAM I have found that if I use my computer for a few hours, eventually it gets to the point where my CPU is working at close to 100% ALL the time. Even if I'm not doing anything. For instance, right now I have 5 apps open, all of them effectively inactive and Activity Monitor is showing full CPU usage right now. It does not seem to fluctuate, just stays at 100%. What's wrong here? If I check the processes list, Finder is using approximately 85-90% of the CPU at any given time. Does this mean there's a bunch of stuff running in the background that really shouldn't be? If so, how do I stop this? The fan keeps coming on, presumably because the CPU is working so hard, even though I have the computer up on a stand where it gets amazing ventilation. Help! Thanks a million.