Need to install Tiger on my iMac and computer won't boot

I've recently had to wipe and format my Intel based iMac (20" intel based iMac, Emc 2133) and am unable to install Tiger from any of the disks. The computer will not boot past the grey screen at start up. The optical drive has just been replaced and is working correctly and pressing C at start up while disk is in is not working either.
Any suggestions?

So what exactly happens when you put your install disc in and try and boot up holding the "C" key? I know you said it doesn't work, but does it just bring you back to the gray screen?
What happens if you boot while holding the Option key? Does it at least get you to the startup manager (aka boot picker)? It should at least do that, since that operates from firmware and should come up regardless of what shape the hard drive is in.
It is difficult to pinpoint the issue here but you might even be looking at a bad logic board judging by firmware operations not working.

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