Playing Cd's On Dell Optiplex 990

To fix these issues, you can try the following troubleshooting:   

1.      Using Microsoft Fix-It Tool:

To fix this problem automatically, click the Fix this problem link. Then, click Run now button from the Automated Troubleshooting Services page and follow the steps in this wizard.
Fix this problem 
Microsoft Automated Troubleshooting Services: Your CD or DVD drive cannot read or write media.
Note: This automatic fix only applies to Windows XP and to Windows Vista. If your computer is running Windows 7, go to "Windows 7" under the "Let me fix it myself" section.

If issue still persists try the Second step Delete Upper / Lower Filters:

1.       Click Start, and then click All Programs.

2.      Click Accessories, and then click Run.

3.      Type regedit, and then click OK. If you are prompted for an administrator password or for a confirmation, type the password, or click Allow.

4.     In the navigation pane, locate and then click the following registry sub key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}

5.      In the right pane, click Upper Filters. 

Note You may also see an UpperFilters.bak registry entry. You do not have to remove that entry. Click Upper Filters only. If you do not see the Upper Filters registry entry, you still might have to remove the Lower Filters registry entry. To do this, go to step 8.

6.     On the Edit menu, click Delete.

7.      When you are prompted to confirm the deletion, click Yes.

8.     In the right pane, click Lower Filters.

Note If you do not see the Lower Filters registry entry, unfortunately this content cannot help you any further. Go to the "Next Steps" section for information about how you can find more solutions or more help on the Microsoft Web site.

9.     On the Edit menu, click Delete.
10.  When you are prompted to confirm the deletion, click Yes.
11.   Exit Registry Editor.
12.  Restart the computer.

You can also run Dell diagnostics from the below mentioned link on optical drive:

http://dell.to/Uh2rvZ