See if this troubleshooter helps:
http://support.dell.com/support/topi...401E0A55172FF4
Sometimes Dell Support will not retain direct links so if the above does not go to:
CD/DVD Drive Not Working (Read/ Write Problems, No Power, or Optical Drive Not Detected) [ Dell™ Desktops, Portables, and Dell Precision™ Workstations ]
Try this path:
http://support.dell.com/
Troubleshooting and FAQs
[search]: detect cd drive
CD/DVD Drive Not Working (Read/ Write Problems, No Power, or Optical Drive Not Detected) [ Dell™ Desktops, Portables, and Dell Precision™ Workstations ]