Thanks for the tip.

I just got it to boot, by doing something very similar. Hold down 'Option' until boot menu comes up, then select CD - then do Cmd-v.

That works a treat.

However, DFA can't do anything with the disc either, but interestingly the (UNDEFINED) errors don't appear int he DFA window, which makes it look like the undefined errors are coming to the console, rather than from 'fsck'.

That means that it's possibly a hardware issue...

Oh well, apple Tech Support opens at 8am tomorrow, let's see what they say.

Cheers,

Paul.