I am trying to fix a client's iMac G5 20" computer that was originally running Tiger. At first it was just running very slowly and it was no longer printing. Downloading & re-installing the printer driver took over 20 minutes and it still wouldn't print. Trying to reboot into Safe Mood failed. I rebooted it into Target mode and used my Powerbook to run Disk Utility, which stated that the HDD was damaged and unrepairable. The files on the drive were still accessible, so I backed up the HDD and tried to do a clean install of Leopard. The first time I tried to install, it failed b/c it found a problem w/ the HDD. I then rebooted the system back into Target Mode & ran Disk Utility to format the HDD using the Zero Out Data Option, which I canceled after 20 min b/c it was taking so long. I then tried to install Leopard & this time it took over an hour to install all the files and when the counter was down to "less than a minute remaining", I got an error message saying that the installation failed. It's odd b/c it seems like it got 99.99% of the way through the install & then failed.
When I start the computer now it seems like it's going to boot up fine, but it just gets caught in a loop where it keeps rebooting itself endlessly. Trying to boot into Single User Mode yields the same result.
I can start it in target mode and if I open the Disk Utility, it shows the drive as not having any errors and working properly. The SMART status shows the drive as "Verified."
I'm going to go back to the client on Monday morning to investigate further. I am bringing DiskWarrior, so I can further test the HDD.
Anyone have any suggestions on what might be happening here?