Well I took mine back today and the guy in the shop said it was broken and will be replaced.
It ended up with quite a lot of faults for a 2 week old machine.
1, the no 1 key fell off (they're replacing it)
2, the power supply overheats enough to burn me when I sat on it last night (replacing this as well)
3, the cooling fan has a duff bearing (very noisy, they are investigating this as I didn't have time to wait for it to kick in while I was there)
4, this problem with the super drive (replacing this as well)
It's really a shame, the quality of my g4 is what tempted me to a macbook. If os x weren't so good I think I'd revert to a pc laptop now. My macbook is the most expensive single thing I have ever bought, hence I am quite dissapointed about the whole thing. My friends have had none of these problems though so I guess I was just unlucky and it's not a common thing.
At least they are fixing it though, but it leaves me laptopless for at least a week which is not a good thing.
Someone else was in the shop with the same drive problem so I reckon apple have made/bought a bad batch of superdrives.
Where are you wgilles?
I'd be amazed if you were the other guy in the Cardiff store today with the same problem as me.