I have installed Lion on an iMac Core duo by mistake - how do I rectify..?

I have installed Lion on an iMac Core Duo, via firewire from an iMac i7.
The Core Duo now goes to grey screen, folder with "?", then the "prohibited" sign for a 30 secs and then turns off,
(I now realise Lion is 64bit and the core duo only supports 32bit...).
The core duo will chime but will not boot off the original install disk or mount as a fire wire target disk.
How do I wipe Lion and reinstall Leopard...?

Sounds like hardware error.
Maybe the target-mode did something bad to the EFI, like fed it 210 proof "Everclear" ...
Try a diferent USB keyboard ... 
Last resort for me before Genius Bar is either SMC Reset (http://support.apple.com/kb/HT3964) and/or PRAM reset (http://docs.info.apple.com/article.html?path=Mac/10.7/en/mh26871.html).
I am out of ideas if the resets cannot bring back "C" boot.

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