Hello who,
I am from Dell Social Media and Community.
Follow the link below to download and run the Microsoft fix it tool for optical drive issues.
http://support.microsoft.com/mats/cd_dvd_drive_problems/en-us
If it is a software issue, this should fix it.
Follow the link below to run a basic hardware test on your system.
http://support.dell.com/support/topics/global.aspx/support/kcs/document?docid=266787
If you get any error code, you can associate it to the list given in the link below.
http://support.dell.com/support/topics/global.aspx/support/kcs/document?c=us&docid=583411&doclang=en&l=en&s=gen&cs=
If this has not helped you or if you need any further assistance, feel free to message me on Twitter(@NiranjanatDell). I will be happy to assist.
Dell-Niranjan