Ive changed the jumpers but the opposite to what you said. The cd has the master jumper and cable end and the dvd has the slave jumper and cable end (the middle bit). Still got the same problem, it wont recognise the dvd in the drive and explorer.exe will stop responing for a while. Ive left it and its now responding again but both optical drives have dissapeared from 'my computer'
edit: just been into the bios again and they are the right way around now. The cd is the master and the dvd is the slave. When i look at the details for the dvd is says
Devie: ATAPI CD-ROM
Looks like its detecting it as a cdrom and not a dvd rom