Mac Mini unable to write to DVD-Rs

Hi, I was wondering if anyone can help. I am trying to write to a DVD-R (I have tried several makes) but the drive does not seem to recognise the disk and spits it out. I am able to write to CD-R & CD-RW but no luck with DVD-Rs.
Super drive is MATSHITA DVD-R UJ-846 and the "more information" panel states that it should have the following capabilities:
CD-Write: -R, -RW
DVD-Write: -R, -RW, +R, +R DL, +RW
Only other thing I can think of that may, or may not, be relevant is that my kids managed to lock the region to USA rather than my native UK. The drive does recognise my DVD copy of iLife 08.
Any help appreciated
Shakey

If you have tried several different brands of DVDs and none worked, there are only 2 possibilities: the problem is in the OS or the hardware. Given the drive in your machine I'd say it is hardware.

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