Chameleon bootloader problem on Imac

I have a huge problem.
I have an HP with Leopard 10.5.8 running on it. And I have an external hard drive on which the bootloader Chameleon was installed. So far so good.

I have also an iMac with Snow Leopard freshly installed on it.
Now, I decided to make a backup copy on my partition of SL.
And I made this copy With Carbon Copy Cloner on the external hard drive with this Chameleon stuff on it…. I didn't mind reformatting the hard drive because I thought CCC would take care of it...
And I booted on the copy to see if it was working...

Now, nothing is working anymore. I cannot boot on the install DVD and none of the other boot options is functioning. Booting while pressing on P and R is also useless. I tried Disk Warrior, no use.

I know that it is the bootloader Chameleon which messed things up. But I do not have any idea of what I should do to get this imac working again.

Maybe somebody has an idea.