Laptop DVD Drive appears then disappears

Hello, I have had this problem since I loaded Windows 7 I think but Can't be sure.

I insert a disc and the drive appears for about 30 seconds and I can play DVD's/Start installations or whatever I want to do, but then after about 30 seconds the drive disappears.

I have tried the Microsoft 'Fix It' solution, the windows troubleshooter and deleting the upper and lower filters in the registry but to no avail.

Any help is much appreciated.

I did search but could only find solutions involving switching SATA cables or running the Drives on IDE cables but obviously in a laptop this is impossible.