No Hard Drive present - help

First, some info about the iMac in question...
iMac (I think it's the 1999/Blueberry version…blueish/green color)
Mac OS 9.0
Mac OS ROM 3.1.1
Built-in Memory: 512 MB
Machine ID: 406
Processor info: PowerPC G3
Machine speed: 350 MHz
Slot Loading CD-Rom Drive
And now the problem...
My father's old iMac went kaput on him. So I've been seeing what I can do to get it up and running. When I turn it on, there's the normal sound of it turning on, but then after the screen lights up, it's silent (no motor/fan going) and it's just the flashing ? mark folder that alternates with the Finder icon on it.
I've tried holding down the Shift Key. Nothing.
Have tried installing the Software Install CD (that came with the computer) while holding down the C key.
It eventually loads up the Install CD, but for the life of me, there's no Hard Drive present at all. So no matter whether I put in the Install CD or the Reinstall CD…whenever i try to activate the installation, and it asks for a destination disk (where I assume the Hard Drive icon would be located), there isn't anything. It's a blank toolbar and the description:
A valid destination volume can't be found.
To continue the installation process, mount a valid volume for software installation.
If I go to Options and click on the Perform Clean Installation, again it's blank since no destination (hard drive) can be found.
If I go into Utilities and Drive Setup, under the List Of Drives to select…is only whichever CD I'm using to actually boot up the computer (either the iMac install CD or the iMac Reinstall CD). The computer won't actually boot up without either of these CDs and holding the C key.
So yeah…no Hard Drive present anywhere for me to install (or reinstall) anything onto it.
I believe the computer was running on OS 9.0 when he first got it. Eventually Panther OS X 10.3.5 was purchased and installed. And both worked fine. And depending on various programs, it would use either 9.0 or the 10.3.5 without any problems.
I've tried inserting the Panther OS X Disks as well, but still without any hard drive present, it can't update that version either (and I figure I'd want to start with 9.0 before reinstalling 10.3.5 anyways).
Any idea what the heck might've happened? I realize that the computer is over 10 years old and might've just finally conked out. Although it would be nice to try to recover any files if there's a chance, or use the scanner that was set up to work on the older operating system.
Much thanks!

If I go into Utilities and Drive Setup, under the List Of Drives to select…is only whichever CD I'm using to actually boot up the computer
The Hard drive has died. If it cannot be seen by Disk Utility or Apple System profiler, it cannot be repaired in its current state. If the cables are connected properly, it has died.

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    I am experiencing a similar problem. I already had all my files on an external drive, where I had transfered them a few months back, and everything was working fine. I have now moved them, again, to a larger external drive, did everything the same, but now receive the message "original file cannot be found, would you like to locate file?" I was advised to use the "add to library" button under "FILE" in the menu bar and all the music was finally imported into iTunes, but the problem now is that the new data on the music files is missing all the metadata, and I am still stuck with all the original files with the "!" in front of each file that is going to have to be manually deleted one file at a time, all 30,000 of them. I would like a way to start over and get it right the first time. Anyone have any solutions? I have found a program, "Super Remove Dead Tracks" which should solve the problem of eliminating the "!" tracks, but so too all the metadata. Ideally I'd like to be able to locate the original files with all the attached metadata and get back to where I was 24 hours ago.

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