G5 iSight iMac won't start up at all - big grey flashing folder icon

Hi
Acquired a second hand intel imac (iSight model) - when I first got it, it started up fine (it had 10.4 installed), then I tried to do a carbon copy clone on to it using Carbon Copy Cloner to clone my old mac's system on to my new one and now it's stuffed.
I get the flashing question mark when I try to boot it.
Tried booting from a black Tiger disk - won't start from that (holding down C key won't work, holding down Option key won't give a selection of disks to start up from shows nothing)
Tried starting it up in Target mode from my old iMac (angle poise one) and I can see it fine mounted on angle poise iMac's desktop. Erased it again using disk utils from the angle poise imac again to start again...
Can't start up from my bootable external HD attached to it (firewire)
Can't use fsck on it as I can't start up in Single User mode (nothing happens)
Anybody got any ideas? Can I have stuffed the machine by using CCC and trying to clone to it?
Have also tried Resetting PRAM and SMU.
I've run out of ideas....
Thanks for any help

First, I'm a bit confused with your reference to "angle poised" Mac - what is that?
Second, you said:
"then I tried to do a carbon copy clone on to it using Carbon Copy Cloner to clone my old mac's system on to my new one and now it's stuffed."
Since your old Mac is a PPC, it won't work if your new Mac is an Intel (and, if it is an Intel, it is NOT a G5 - the G5 iSight was the last PPC made before switching to Intel).
Third, the "black" Tiger disk you used - is that a retail version for a PPC or Intel Mac?
At this point, I'm guessing that your "new" Mac didn't like the fact that you installed a PPC version of the OS and/or the OS version you installed was older than what the "new" Mac came with.
Since you've already tried all the usual things, I'd ask the person who gave it to you for some information on the exact tech specs to see if we can figure out why this happened and, if necessary, call a local Apple repair shop for some advice - I'm assuming you're no longer under warranty?

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