MC3000 No cue from headphones

Help… My mc3000 drives me nuts guess im just not upto speed.

I loose my headphones output… has happened a lot and been intermittent don’t know why but thought it was a power supply issue… im using my mcx8000 power supply as my mc3000 broke. Running a mac tried all settings sound wise detects mc3000 core audio but nothing also filter not working…

Not very good with forums.

Steve