Nah, HDD's both on IDE1 and optical drives on IDE2......

As I said before tho - I have changed NOTHING in my PC in the last year, and earlier this year (may? June?) I burned a shed load of data DVD's with no probs. It's only when I tried it in the last week that it's refused to burn to DVD-R, but has no probs with CD-R or DVD+RW.... Also, the DVD-R's I am using are the same ones I used on my last burn so the discs aren't different either...

I could understand getting one or even two dodgy discs, but I have tried EVERY single one of the 10 or 11 I have left in this pack and none work, two different burning apps, and the windows built in one..... So I think it must be the drive....