Refresh rate of the external monitor (closed macbook) reset

Hello

Im very new to OS X, I have a macbook air 13 "that I have it plugged into my external monitor acer, when he was in closed mode (clamshell) I changed frequency by accident and now I can't change this back as the ' entry is not displayed. How can I change the refresh rate of the external monitor when the settings show only if the macbook is closed? As I said, I'm new so I am not very confident through many parameters, any help is appreciated.

If you have previously enabled "Screen sharing" Preferences-> sharing system then you can use another Mac to control this Mac and change it to one that works remotely.

You could 'open' the Mac to use its built-in screen and then be able to change the settings of the external monitor.

You can try to reset the setting by following the steps listed here Re: how to restore the display settings

Tags: Mac OS & System Software

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