Mac OS no longer found

I have an iMac, circa 2004, running 10.5. the other day it crashed, and since then has not been able to boot. I get the apple icon and the spinning circle, then after awhile the fan goes crazy, but it never boots.
Today I tried starting off the leopard install discs. it boots, but when I get to the installer, my hard drive is not shown as an option to re-install to. only sees my external hd, which I obviously don't want to use as the destination.
any advice?

Sounds like you had a harddrive failure. Have you a backup?
You don't want to reinstall, you only want to repair from the DVD, so boot into it and after the language screen, in the menu, top left, under Utilities, select Disk Utility and see what your options are. If DU cannot locate your HD, it may be hosed or you may have some other hardware failure - logic board, etc.
If this does not work, reset PRAM
http://support.apple.com/kb/HT1379
and if that does not work, it's time for a call on Apple for repairs.

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