CD-DVD drive disappeared...

Hi. I have an HP Pavilion dv6700 Notebook with Vista Home Premium. The computer
is just over a year old and the Pioneer DVDRW drive (DR-KD08HB) just stopped
working. It no longer appears under Device Manager or Windows Explorer and the
disk tray won't even open. I've had no problems with this drive before, it
seemed to die on me yesterday after I inserted a CD (which I can't retrieve).

I ran the Microsoft Fix it 50027 but nothing happened.

Is there anything I can do to get it working again?