Hello, I've had my G5 Dual 2Ghz Powermac for about 3 months. After about a month and a half of use, one day the box wouldn't boot and stayed stuck in the gray screen interminably. The fans began to howl and got so loud I thought the box would explode. I called Apple support and booted from the installation DVD and attempted to repair the disk. It didn't work. I backed up the data via firewire and reinstalled the OS per Apple's instructions and received some advice that I need to repair permissions more often. Ok. Well I've been repairing my permissions often (a huge design flaw in my opinion to expect the average user to do this all the time or risk a useless yet sleek hunk of metal) and then yesterday couldn't log in anymore. "Permissions broken see your Administrator" (or something to that effect) when the login screen came up. Then the machine would freeze. I attempted to boot repair permissions from the installation DVD - it hung. I attempted to repair the disk - I got error -9972 invalid node structure couldn't repair disk. Arg. I backed up via Firewaire and reinstalled. Within 2 hours it happened again!!!! Gray screen lockup on boot. Repair permissions hangs. Repair disk returns error -9972 couldn't repair disk. I booted up in single user mode and tried to run fsck -f. It started to run and then the fans got so loud I though the box would explode. I turned off the box after 10 mins and gave up. Any suggestions? Why is this happening? What can I do to fix it and avoid an entire reinstall again? Many thanks!