Ok, sounds simple; it's not compatible... So let me explain
I was updating to Vista from XP to try and stop my friend from downloading spyware. After updating he calls me the next day to say his DVD drive isn't working. I go up and try out my drive from my dead PC that is definitely compatible with Vista. It still doesn't work. I assumed it would be the ribbon cable (it could have caught in one of the fans) but I couldn't test it straight away because the HDD is SATA2. So I come home and get one of my IDE cables, but it still doesn't work, not even showing up in the BIOS using the auto-detect.
So I decided to roll him back to XP to see if it is just a Vista issue (which I highly doubt anyway). Obviously though, he doesn't have a DVD drive now to install from.
So, question 1: Any ideas what would suddenly cause it to stop registering drives
and
question 2: just in case, how can I get it back to XP (I don't care about losing data by the way, there is not much on there at this point
/ 
