Superdrive spitting out DVD's on 'Burn' (iDVD)

Greetings.

I am trying to produce a very short (3 Minutes) film.

I get as far as clicking on the burn 'eye' - it asks me to insert a recordable DVD. I do. (It's a DVD-R disc, by the way.)

The Superdrive grunts for a while and ejects the disc. Repeated attempts produce the same result.

Suspecting poor quality DVD's (although I used them before) I went out and bought a pack of Memorex DVD's. Again, the drive rejects them.

Any suggestions as to what I can try next?

I'm using iMovie/iDVD version 6 on an Intel iMac, by the way.

Cheers Mitcherooney

have you tried 'Save As Disk Image' then burning the image in Disk Utility?

I've never had a problem with Verbatim and never burn a maximum speed.

Thanks James, for your reply.

I've done some further investigation and I now find that the drive is rejecting genuine, shop bought DVD's as well. I'm beginning to suspect the drive itself....

I've got Win XP running under Parallels and here also the commercial discs are ejected.

A call to the Apple store for a replacement drive methinks...

Gloom...

Cheers M