About three months ago my powerbook G3 with OSX 10.2 started acting crazy: shutting down at odd times, problems mounting the hard drive, renaming files and the startup disk, strange icons appearing in the control strip. After the first time this happened everything seemingly went back to normal after restarting about 15 times because drive would not mount. Gradually it began happening more and more frequently and I took it in to a computer shop specializing in mac problems. They said all they could do is change the drive which they did. Now it's starting to happen again with the new hard drive. Any help would be greatly appreciated.