I am stuck for ideas on how to make my PowerBook G4 run like it used to. I have a (pretty old now) G4, 80g -with more than 40g of space left, running OS X 10.4 and 512 of ram. I get about 20 minutes from the battery, so have it plugged into the socket most of the time. Basically it is slow. It beachballs often, the fan is on more often than it used to be, some USB devices wont work on it. Also recently applications have started to 'quit unexpectedly' more often than they used to. I love this machine and really don't want to upgrade. Is there anything I can do to make it run better? My mates same spec G4 works much better than mine. Any help would be really appreciated. Thanks.