IMac G5 won't boot. Attempted to install Leopard,wouldn't allow, then would not reboot in HD's Tiger, nor from OS DISK IN DRIVE. OPTION START shows both OS 's, but still won't boot from either. Grey screen , spinning pinwheel for 5 minutes, then shuts off

When I tried a custom leopard install(omitting all but canon printers), a window appeared that " I could not install OSX ON THIS DISK." I tried a full install again and a window appeared stating that " the HD was not formatted properly, would I like reformat in hfs extended HFS EXTENDED journalled and ERASE THE HD?" I use disk utility on leopard to reset the iMac to restart from the original Tiger OS on the HD, & that was when it refused to boot. During 1 attempt I even tried to boot with the C key held for many minutes to start fron the Tiger OS disk but the iMac wouldn't start the cd spinning. I did hear that familiar FIRMWARE UPDATE CHIME! but I was not upgrading firmware as none was downloaded, and Leopard did not tell me it required a firmware update first, when I attempted to install it. So: I get the chime when the power button is pressed. Option key finds the HD TIGER AND THE CD 's Tiger. I van choose both. But neither boots. Starting with the C key held doesn't boot. In every case the startup grey screen appears with the grey startup pinwheel, this continues for many minutes. Then it shuts itself off. Help help help. My son has Graduate School papers in progress, and I just fried his iMac. Thanks to all.

Simon:
Thanks very much for the suggestions! I tried your method of booting to the install CD while holding option (alt), and then running Disk Utility to repair the disk and the permissions. Even though it still told me the drive didn't need repairing, there were more permissions that needed repairing when booting this way (as opposed to when booting while holding the C key.)
Anyhow, after doing this, my computer restarted just fine from the hard drive. Mail works now and I'm about to try repairing permissions one more time, then shutting down and restarting again, this time without doing it from the install CD. Wish me luck...
OK. It booted up perfectly this time. I'm not quite sure why that worked, though. Anyone care to illuminate me as to why booting while holding option (alt) let Disk Utility do what it needed to, while booting while holding C didn't?
At this point I'm just curious. My problem has been solved!
Thanks again very much, Simon. I really appreciate it, mate.
Cheers,
--forkboy
iMac G5 20" Mac OS X (10.4.9)

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