External Display Flickering Static When Connected Thru HDMI Splitter

I have a Late 2011 MBP, just recently I also go an Xbox and wanted to hook it up to my external display that I have been using for a long time with no issues. I went and bought this: http://www.amazon.com/gp/product/B003AQD5W6/ref=oh_details_o00_s00_i00?ie=UTF8&p sc=1

to be able to easily switch between the two inputs. The xbox works fine, however when I view my Macs input the screen flickers a static image very frequently.


User uploaded file


I know what you're thinking, it's probably an issue with either a cable, or the device. But when I boot into Windows via Bootcamp with the same exact setup, there is no flicker at all.


The display is a dell s2440L, the HDMI adapter is a rocket fish.


Here are the troubleshooting steps I have tried:


  • Resetting PRAM/SMC
  • Changing out HDMI cables on both the Splitter output, and the inputs (I tried 3 different cables on both the inputs, and outputs.)
  • Downgrading OSX to 10.7 (And then went back to 10.9)
  • Lowering the resolution on the monitor (Lower resolutions flicker just as much, if not more.)
  • Resetting the splitter by unplugging the HDMI cord powering it and plugging it back in.
  • and of course, plugging my computer into the splitter input that the Xbox works fine on, as well as taking the xbox one out so the computer is the only input on the splitter.


Like I said, the Xbox works fine, and even the computer works fine in Windows, but whenever I boot into OSX my screen flickers with this static.


I should add, the display works fine when not connected to the splitter on OSX.

Posted on Jun 25, 2014 3:34 PM

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1 reply

Sep 11, 2014 9:27 AM in response to zak123

I am using a late 2011 MBP 15" and have it hooked up to a Dell S2440L via hdmi to thunderbolt and have a constant static and blacking out of the screen. Same as you, when running my MBP in bootcamp windows it runs awesome. The second I'm in OSX flickering and static come back. The only way I can get it to work on OSX is by setting resolution to 1080i (which is incredibly blurry). Wasn't sure if you had any resolution on this. I have been looking all over for an answer and would love to find one.

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External Display Flickering Static When Connected Thru HDMI Splitter

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