There is always the infamous UpperFilters or LowerFilters fix found on this
Microsoft Website.
If the troubleshooter for Windows 7, first recommendation, does not work, check your registry for the UpperFilters or LowerFilters mentioned on the page.
If that is not the case, open the Computer dialog window. Watch the listed drives and open the tray on the DVD. If it shows up at all, you may need a firmware update. It would be strange for this to be the case, since the drive has been working in Windows 7.
Of course, there may be a chance of the bad connection.