1 Reply Latest reply: Aug 26, 2013 10:28 AM by rcchristo
rcchristo Level 1 Level 1 (0 points)

Late 2011 15" Macbook Pro I have an issue where my external monitors make noise when external monitor is connected at the same time.  The second I unplug my secondary monitor from the Thunderbolt port then the sound dissapears.  I am assuming its a grounding issue but I went out and bought a power conditioner to plug everything into hoping it would resolve my issue but no luck.   Any ideas are always helpful, I will post if I make progress



MacBook Pro, OS X Mountain Lion (10.8.4), 16gb ram, 256gb SSD, 750gb HHD, i7
  • rcchristo Level 1 Level 1 (0 points)

    Looks like I found the answer to my own problem.   I tried to isolate the monitors power from the same power source of the speakers and had no luck.   I then decided I had enough spare power cords for the monitor/speakers laying around that I would just break the third plug (ground) off the monitors power cord (the side that plugs into the wall.   Well sure as sh#t this worked and the noise is gone.  The additional ground was creating noise as expected.