I have a G4 1.67 Powerbook running Leopard 10.5.6. In October of last year, I had a 250g hard drive installed. It's been running like a dream. AppleCare ran out in early February, of course. It froze during normal use on Sunday, the 5th, yesterday. It finally booted up later that night. I used it for an hour with no problems, so I backed up some important data. This morning it froze again. Here are the results of other boot attempts, in no particular order: It sometimes won't even get to the gray screen. It sometimes gets to the gray screen, then the circle with a line through it appears. It sometimes gets to the user login, but the neither the keyboard nor trackpad will not respond so I can't attempt to type in the password. I found my Leopard DVD tonight (finally), but it won't get to the gray screen. It made it to the language selection screen of the DVD Install, but, again, neither the keyboard nor trackpad would respond so I could make a selection. Is this more apt to be the logic board than the hard drive? I think I just need to hear it from someone - she's a goner... p.s. I have a G4 iBook running Leopard. If there's a way to try to access the PB disc for maintenance, please let me know.