IMac 27" won't boot (after Time Machine bug?)

Hi everyone,
Firstly, I don't know if my iMac is an Intel machine or not.
I recently had my failing hard drive (seagate, I think) replaced by Apple.
I had backed up using a hard drive using Time Machine.
I attempted to restore my back up to my now fixed iMac. It failed after about 3%. I ran 'verify' in disk utility and it told me the hard drive with the back up was fine.
I tried again to get my back up onto my iMac. It failed again. Again after about 3%
Now, this is when I think I made my big mistake - I asked my computer to boot from the Mac harddrive. Does this mean I told my computer to boot from something that was only 3% installed?
Anyway, it will not boot. Lots of text pops up on the screen, it goes round and round in circles for a while. Then an icon resembling a no entry road sign pops up and it gives up.
I have tried holding down command and r both with the Mac OS X Install DVD in the optical drive and not in.
I have tried holding down 'c' with the Mac OS X Install DVD in the optical drive.
No luck.
Can anyone help please? Please tell me how I can provide further information. Take a video of what happens, perhaps?
Thank you.

Please make a Genius Appointment and take it in for service.

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