LG GSA-4163B Problems recording to DVD-R or DVD-RW Discs

I have installed a Pioneer DVD-ROM drive and a newer LG GSA-4163B DVD-RAM drive. Both drives will read CD’s and the LG drive will also record to CD but neither will play a DVD (but will recognise that a disc is in the drive), and the LG wont even recognise a recordable DVD in either DVD-R or DVD-RW media format. I have tried removing the Pioneer DVD-ROM from the serial cable, and I have also updated the firmware version to the latest (1.5 i think) and nothing seems to make any difference.

Any thoughts?