This has been a major tail chasing exercise, but I thought I should write back to you guys becaue you’ve been helpful.
I did indeed remove InCd as it was causing other problems. But I found that when I ran Windows in safemode by DVD was fully recognised, present, and correct. So I set about finding the differences between the settings in normal boot up and safemode for the drive.
It turns out that the IDE1008 wouldn’t work properly when set to Ultra DMA 4, it does however get recognised and work fine when set to PIO (although I know that’s slow and not right it’s a start!).
I had a look around on the web and it seems that many other people have this problem with DVDs under XP not just BTC drives either.
Has anyone got any further ideas? There are some suggestions about editing registries to force DMA to be accepted but based on past experience I’d like to try something less radical first.
Thanks for your help