IMac G5 iSight freezes on startup - CDs won't work

Hi everyone.
My iMac G5 iSight is freezing up on startup. It was running slowly and erratically, so I restarted it - ever since it has failed to start up.
It gets though the basic hardware check and gets to a point where there is the big apple logo and the circular pulsing thing that suggests it is loading - however it never gets any further.
I tried loading with a CD holding the c key -but that won't work. The CD drive revs up, but it gets stuck at the same location.
I've zapped the PRAM several times (twice each). No effect.
I've disconnected the keyboard and all peripherals.
I've removed the memory module I added 2 years ago.
So, I'm stuck. It doesn't look like complete hardware failure - or it wouldn't get as far is it does.
Is there any other way to force a reset of some kind that will allow me to boot from a CD?
Thanks in Advance.

Check the Repair extension programs and look for your number. Whether you qualify also depends on how old your computer is. The extension cuts off three years after the original purchase date, but they have been known to make exceptions.

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IMac G5 iSight freezes on startup - CDs won't work

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