Screen goes blank when plugging in HDMI cable?

October 31, 2016 at 11:28:28
Specs: Windows 10 (Bootcamp via MacOS X), Macbook pro, Mid-2015, 15"
Whenever I plug in my HDMI cable my screens go blank.

I accidentally checked a secondary box to make my display primary on my extra monitor, but before that, I WAS supposed to change a refresh rate setting on the extra monitor so the picture would appear... but now, I'm stuck with a blank screen since I didn't do the above.

Yes I'm using Windows 10 Bootcamp via a Macbook Pro, but surely that doesn't matter right?

Is there a way to just reset HDMI / video settings to start over? I want to start over from scratch when I plug in my HDMI cable. Thoughts?


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#1
November 1, 2016 at 03:57:13
Can you see the display on the second monitor? Or do both monitors go blank? If you plug the cable in, then boot the computer, what happens?

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#2
November 2, 2016 at 21:32:12
Blank screens on both, even the external monitor.

Just tried restarting WITH the hdmi cable plugged in, still blank screens on both.

Checking that box making the secondary monitor primary really screwed it up :/

All I really need to do is start the whole process over like nothing happened but I have no idea how to do that...


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#3
November 2, 2016 at 23:45:12
Under Settings > System > Display > Some setting should enable you to set the screen order and identification.

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Related Solutions

#4
November 5, 2016 at 22:26:20
I understand that, but I can't get into that menu to set the screen order if I can't see anything.

When the HDMI isn't plugged, the set order is primary on the laptop main screen.

When the HDMI is plugged in, my external monitor becomes the primary display (due to me clicking it primary on accident on the first time) which then becomes blank on both screens

message edited by seijuro


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#5
November 6, 2016 at 16:02:23
Try a system restore to the date before you changed the setting.

There should be a registry entry for monitors, but I haven't found it yet


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#6
November 6, 2016 at 16:38:10
Unfortunately I don't have nor did I set up any system restores before I created this setting...

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#7
November 7, 2016 at 08:45:36
Anybody else? Any other thoughts?

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#8
November 8, 2016 at 15:54:43
Nobody really knows how to reset all video settings when plugging in an external monitor? 🤔

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#9
November 14, 2016 at 09:03:05
Anyone? Anyone?? Bueller?

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#10
November 14, 2016 at 09:41:14
You might try booting into safe mode and see if you can change the display options in there. Safe mode loads a minimal set of drivers and may display differently than normal mode.

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#11
November 26, 2016 at 11:04:55
I know nothing about the Macbook, whether Pro or amateur, but
it must have a key on the keyboard to press to switch between
using the built-in screen, an external monitor, or both. Have you
toggled that? It should override your setting the external monitor
as the default.

-- Jeff, in Minneapolis


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