I have a MacBook Pro model 8,1 running El Capitan. I have always had an NEC monitor attached via the mini-Display port to a Display Port on the monitor. It worked fine.................. until.
Recently I attached a JBL 'On Tour' external speaker to the audio-out on the Mac and now I have all sorts of issues.
The monitor often goes blank when I connect it, the monitor often doesn't work (mirroring) when I wake the system up, (there's a message on it saying 'Display Port - no signal), the Mac crashes, the speakers won't work when plugged-in and the volume level shown on the screen displays a 'no entry' sign.
These issues started the day I first used the external speakers. but continue when they aren't attached.
Sometimes it works just fine......... but not often.
Any thoughts?
Last edited by Rain; 07/22/16 04:00 PM.
