I am having some trouble with my Powerbook G4. I am pretty sure my hard drive is failing but want to get some other opinions before I start replacing stuff. Over the last couple days the HDD starting make strange noises (clicking a lot, along with other undescribale noises). I am wanting to hold off buying a MBP until after Leopard is out. I am wondering a few things: 1. Is my diagnosis of bad HDD right? 2. How easy is it to replace the HDD with a new one (seems pretty easy reading instructions from ifixit.com) 3. Will any 2.5" ATA drive work? 4. I installed OS X on a firewire drive before the internal drive died but now it will not boot. Am I right in assuming once the new drive is in I can pop the Install disk in and install OS X? 5. Am I forgetting anything? Any tips? Thanks much for the help!