Q: Macbook pro retina (Mid 2014) won't send signal to external display

Ok. I have a new Dell U2415 monitor. Using the supplied display port to mini display port cable, I can connect the display to a thunderbolt port on an iMac and the display is recognized immediately. When I plug it into a thunderbolt port on my rMBP mid 2014, The dell monitor says it is going into power save mode and that the macbook isn't sending any signal. When I open display preferences on the computer it shows the Dell U2415 in the screen arrangement and acts like it see the monitor correctly.

Like I said it works flawlessly on my iMac in the office.

MacBook Pro (Retina, 15-inch, Mid 2014)

Posted on Feb 23, 2015 7:00 AM

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Q: Macbook pro retina (Mid 2014) won't send signal to external display

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by Brett L,

Brett L Feb 24, 2015 8:41 AM in response to chadnodoubt
Community Specialists

Feb 24, 2015 8:41 AM in response to chadnodoubt

Howdy chadnodoubt,

If you are having an issue with your external display not performing as expected when connected with your MacBook Pro, I would suggest that you troubleshoot using the steps in this article -

Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support

Thanks for using Apple Support Communities.

Best,

Brett L
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by msim20,

msim20 Apr 21, 2015 2:14 PM in response to chadnodoubt
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Photos for Mac

Apr 21, 2015 2:14 PM in response to chadnodoubt

@chadnodoubt - were you able to solve your problem with the U2415 and the macbook pro? I have an older Macbook pro and I have the same problem. I am able to drive a Dell U2412M without any problem with the display port mini to display port cable. But I am not able to use the U2415. Very disappointed
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by andyappel,

andyappel Jul 24, 2015 3:17 PM in response to chadnodoubt
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Jul 24, 2015 3:17 PM in response to chadnodoubt

I have a similar issue. My MacBook Pro 15" (mid 2010) works great with an external display but when I move the same setup to my MacBook Pro Retina (2014) i get no video signal. Same monitor. Same DisplayPort adapter.
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by Brett L,

by msim20,

by andyappel,

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