Sound output jack not working

Hello everyone,
The internal speakers on my iMac still work, but when I plus in my external speakers through the output jack (which used to work nicely), I can only hear the internal speakers. I've restarted many times, un- and re-plugged many times. I've also made sure that the speakers work in my old iMac. Any suggestions?
Thanks!

cliveb74 wrote:
I've had this a few time with my imac, in fact two minutes ago.  Move a headphone jack quickly in and out gently seems to clear any dirt from the connection and has always worked for me.
Good luck.
Its actually not removing anything, there is an internal switch on the macbook for the headphone port. If headphones are removed too quickly then the switch does not reset and it still believes headphones are connecting. If you move it quickly in and out you risk damaging that switch.

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