Reinstall without OS disk

I bought my iMac G5 off ebay, and all was going well until one day it wouldn't boot. It wouldn't get past the apple logo, fans were attempting orbit (On full) etc. etc. I have tried all the hints off the web for solving the Turbo Fan problem, but none have been fruitful. The issue is that as I bought my G5 off ebay, the seller shipped it with the original Tiger disks (As he should, as he installed Leopard after purchase). I now want to try reinstalling Leopard (It's on the HD, just possibly corrupt), but my conundrum is, no disks for Leopard. And weirdly enough, the Leopard disks off ebay are more expensive than Snow Leopard! I might have to go back to Tiger, and I was wanting some info on the features of Tiger compared with Leopard (What I would miss out on), and whether it would be worth 'downgrading', or if there was any unlikley chance of reinstalling from the HD image.
Many Thanks,
Tecwhizz

Next time after the 2 above choices, you should always have a bootable backup of your Mac's hard drive. Since you have an iMac, the backup HD must be external & connected via Firewire. If you had a backup HD, you could boot the backup & run Disk Utility on the internal HD.
Meanwhile, Will it boot in Safe Mode? See What is Safe Boot, Safe Mode? (Mac OS X)
http://docs.info.apple.com/article.html?artnum=107392
Takes a while to run, but it usually "fixes" some problems.
Another thing to try. Will it boot using the Tiger installer DVD? This would indicate that booting is OK. Also on the disc that you got, should be a copy of the Apple Hardware Test. You could run the AHT to see if there might be a hardware problem.
 Cheers, Tom

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