TS1989 My iMac G5 has flashing question mark folder, no hard drive, no DVD-drive, no target drive - help?

A friend has 'kindly' decided to upgrade my father in law's iMac G5 and apparently found that it ceased to work following an aborted process. I have no idea what he's done but there was a Leopard DVD in the optical drive. The iMac boots to the smiley face folder but scrolls through 2 black screens and one grey screen first. A question mark appears at first then it changes to the smiley face folder with the question mark appearing occasionally.
I cannot get the iMac to see either a hard drive or the DVD drive. No start up disc at all. I have tried starting up in target mode and the target mode sign doesn't appear on the screen nor does the hard drive show on the other mac.
Starting up holding down either 'C', 'X' or 'R' doesn't produce any results. Starting up with 'alt' pressed down produces a screen with a padlock image followed by a white slot to write a password in and a greyish button with an arrow. None of the passwords associated with the machine have got us past this screen.
I can also get a command line on screen by holding down the startup button, hearing a loud beeeeep (firmware update signal?) keep holding down and a white screen with very small text invites me either to write 'mac-boot' or 'shut-down'. Both commands require a password to be effective and so do not work.
Following startup troubleshooting advice has allowed me to identify that there is both a start up button inside and an SMU  reset button. Three of the four led's come on fine and there are no problems with the starter button on the back panel.
I'm loath to change the hard drive at this point as I'm not sure if the HD is duff or something is wrong with the hardware and that another HD would be damaged.
Stumped.

I'll copy what BD wrote:
Is it a USB KB or flakey Wifi?
< be sure to use a usb keyboard >
Your suggestion of removing the PRAM Battery and all power & peripherals was great.
< I didn't think of disconnecting the peripherals. Do it. >
I think also, removing all RAM, Iif possible), then trying to start it a few times, might do it to.
Firmware password protection in Mac OS X ...
http://support.apple.com/kb/HT1352
It would block usage of all the startup keys, like C, N, T, D, CMD+s, CMD+Option+p+r, CMD +v, Option boot will show a lock, and Shift, as well as booting from anything but the Hard Drive.
Force Removing Password Protection
1) Add or remove DIMMs to change the total amount of RAM in the computer.
2) Then, the PRAM must be reset 3 times. (Command + Option + P + R).
http://www.securemac.com/openfirmwarepasswordprotection.php
Thanks BD.
Robert

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    Message was edited by: Grant Bennet-Alder

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    I tried all of these steps http://support.apple.com/kb/ts1440
    and these steps http://support.apple.com/kb/TS2570
    I can't get anything to pop up upon start up other than the folder (ie when I hold down the C key with the Instal DVD in it thinks for a minute, spits out the DVD and the folder comes back).
    If anyone has any ideas I'd greatly appreciate it.  I'm even fine with erasing my hard drive if need be, I just want to get the computer back up and running.

    You can go no further unless you're able to boot from your installation DVD. If your machine came with Snow Leopard installed, that would be the gray disc that was in the box. If you upgraded to Snow Leopard, then it would be the retail disc you used to upgrade. No other disc will work.
    With the machine powered on, insert the disc. Hold down the power button until it shuts off. Press the power button again to turn it back on, then immediately hold down the C key. Keep holding until you see the Apple logo on the display.
    If this procedure doesn't work for you, and you've done everything you say you've done, then you have either a hardware fault or a damaged disc.

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