I have a 17" PB, 1.33 ghz with 1.76gb ram. In September it gave signs of the hard drive failing. It would crash right after booting and then not boot at all. If I booted into target disk mode i could still access the files. I backed everything up and did many versions of trying to reformat / reinstall my OS to no avail. When Leopard came out I went through the process again to see if that might help but it didn't. Today I replaced the HD and now it still won't boot at all. It goes to the grey apple screen with the rotating loading icon and stalls. I've let it sit there for 10 minutes or more. I have leopard installed on the new drive (using target disk mode) and I can use my PB's HD as a boot disk in target disk mode on my GF's MBP . I don't know what I can do. I had the thing all apart to replace the HD and nothing looked out of the ordinary. I get the normal startup sound and there aren't any POST codes. Has anyone seen this type of behavior?