I am running OS X 10.5.5 on an iMac G5 2ghz (do not have OS CD's) and when I tried to boot up this morning the Finder is in a constant loop. Menu bar is blinking on and off and no icons on the desktop. I can access anything on the dock. So I first tried Disk Utility and that didn't help.
Than I zapped the pram, no help
Booted into Open Firmware and ran reset-nvram and reset-all, didn't help
Rebooted and ran FSCK -fy, twice and didn't help
Ran Disk Utility from OS X 10.4 didn't help
Tried to boot into Firewire Disk Mode onto an Emac running 10.4.11, disk never showed up
Made a new account in System Prefences and booted into that, same problem!!
Anyone have any suggestions? Wish I had a 10.5 DVD so I could do an archive and install.