I have a powerbook G4 800, OSX 10.23 and everytime I try to boot it up now, it doesn't get past the gray bootscreen with the spinning disk! I had to do a hard reset when it crashed, wasn't doing ...

I bought a non-functional PowerBook G4 off Craigslist as a project to see if I could get it working and have a Mac for a low price. I have already taken it to the Apple store and were not able to tell ...