I recently had to erase and restore my mac as it developed a terrible hard drive failure, and ever since I've had odd behaviour (already posted one other question today). For some reason the Login screen is mirrored on both my monitors and annoyingly this changes the resolution and aspect ratio shown on the MacBook, I really don't like it, and it's never done this before. It also creates a strange animation as the screen logs in which I fins even more annoying. Before the second monitor would show the background of the login screen but certainly would not effect the resolution of the main screen or be mirrored. What's going on there?


Two screenshots, one of the displays and a profile error which I can't help but feel is also a side effect of the issue I had.enter image description hereenter image description here

  • Could we see the Screen drivers settings in your ColorSync app located in your Utility folder – Ruskes Jul 28 '14 at 19:33
  • @Buscar웃 Sure, which screen shot would you want specifically, I'll attach one now, but if you need more, just say. – Mackey18 Jul 28 '14 at 19:45
  • Is it just the login window that appears on both screens? Once you log in do you see two different sets of icons/windows/etc, or the same one mirrored? – Alistair McMillan Jul 28 '14 at 19:49
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    Alternately, have you pressed command+F1 (shortcut to switch between mirroring and extended desktop) while at the login screen? – Mr Rabbit Jul 28 '14 at 19:52
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    @MrRabbit while I definitely haven't pressed that, pressing it on the Login screen fixed the issue, had no idea that was the shortcut. Feel like a numpty for not thinking of something like that. Problem solved – Mackey18 Jul 28 '14 at 19:54

Pressing +F1 is the shortcut for switching between mirrored (same thing on both displays) and extended desktop (each display is independent) modes.

Pressing that while at the login screen should sort your problem.

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