I would suggest you to follow the below mentioned steps in the order specified, which could fix the issue:
• Determine when the noise occurs in the CD Drive.
• Test the CD Drive with a Known-Good Media (Try multiple types of disc).
• If possible try reseating Optical drive and check if the noise problem stops. For removing the Optical Drive you can refer to the URL mentioned: http://support.dell.com/support/edo...
• If the issue still occurs, download and install the Latest Optical Drive Firmware and BIOS from support site. For that click on the URL mentioned: http://www.dell.com/support/drivers...
• If the noise is abnormal, then your computer’s CD Drive might have gone bad and needs to be replaced.
Kindly let me know for further clarifications.
Thanks & Regards