I have a 2009 2.0 C2D Mac Mini that I upgraded to 4 GB RAM from the standard 1 GB RAM. It does not read CDs/DVDs or any other optical media.
When I check the profiler for the SATA connection, I get:
OPTIARC DVD RW AD-5670S:
Model: OPTIARC DVD RW AD-5670S
Revision: 2AHF
Native Command Queuing: No
Detachable Drive: No
Power Off: No
Async Notification: Yes
When I check the profiler for disc burning, I get:
OPTIARC DVD RW AD-5670S:
Firmware Revision: 2AHF
Interconnect: ATAPI
Burn Support: Yes (Apple Shipping Drive)
Cache: 2048 KB
Reads DVD: Yes
CD-Write: -R, -RW
DVD-Write: -R, -R DL, -RW, +R, +R DL, +RW
Write Strategies: CD-TAO, CD-SAO, CD-Raw, DVD-DAO
Media: Insert media and refresh to show available burn speeds
It seems the controller is good and is seeing the DVD drive, but it just won't read anything included DVD movies and CDs that I bought off the shelf.
Any solutions/suggestions?

When I check the profiler for the SATA connection, I get:
OPTIARC DVD RW AD-5670S:
Model: OPTIARC DVD RW AD-5670S
Revision: 2AHF
Native Command Queuing: No
Detachable Drive: No
Power Off: No
Async Notification: Yes
When I check the profiler for disc burning, I get:
OPTIARC DVD RW AD-5670S:
Firmware Revision: 2AHF
Interconnect: ATAPI
Burn Support: Yes (Apple Shipping Drive)
Cache: 2048 KB
Reads DVD: Yes
CD-Write: -R, -RW
DVD-Write: -R, -R DL, -RW, +R, +R DL, +RW
Write Strategies: CD-TAO, CD-SAO, CD-Raw, DVD-DAO
Media: Insert media and refresh to show available burn speeds
It seems the controller is good and is seeing the DVD drive, but it just won't read anything included DVD movies and CDs that I bought off the shelf.
Any solutions/suggestions?