Mac won't recognise external burner

my mac has been working with my external apple burner, however, it now won't recognise it even though i have a blank cd inserted and i'm unable to eject it

Turn off everything and disconnect the external burner, then do an NVRAM reset.
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R.
Turn on your Mac.
Press and hold the Command-Option-P-R keys immediately after you hear the startup sound.
Hold these keys until the computer restarts and you hear the startup sound for a second time.
Release the keys.
Reconnect the burner and try using it.
(Excerpt from How to Reset NVRAM on your Mac - Apple Support)

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