dvd problems
My iMac has stopped recognising the external DVD device which will accept a DVD/CD, apparently rad it and then elect it. The DVD is not included in the systems information.
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Try restarting in Safe Mode per the directions in
Use safe mode to isolate issues with your Mac
If you still have issues, then try:
How to reset NVRAM on your Mac
If you continue to have DVD problems then change the USB cable and or the DVD drive.