Macbook no longer detects external Monitor

Discussion in 'Mac Basics and Help' started by CookieCarol, Sep 6, 2015.

  1. CookieCarol macrumors newbie

    Sep 6, 2015

    I'm using a MacBook Pro (13-inch, Mid 2012) and running Yosemite on it.

    I had my MacBook unplugged and connected to an external monitor. The battery died and so the computer went off. When I turned it back on later, it wouldn't detect my external monitor anymore.

    I tried restarting with the cables unplugged and plugging them back in.
    I tried opening Color Sync utility and system preferences and neither see the monitor.
    I tried rolling my mouse over to the monitor, but it's not there. Just the main one on the laptop.
    I tried plugging the monitor into another macbook and that works fine. So it's something on the laptop which is wrong.

    If anyone has any possible solutions to this problem, I would greatly appreciate it. Thesis checkpoint deadlines are fast approaching. *sweats*

    Thank you!!
  2. barbu macrumors 6502


    Jul 8, 2013
    Sounds like you tried some very good troubleshooting techniques. You could try the good old NVRAM zap and see if that helps:

    Resetting NVRAM
    1. Shut down your Mac.
    2. Locate the following keys on the keyboard: Command (⌘), Option, P, and R.
    3. Turn on your Mac.
    4. Press and hold the Command-Option-P-R keys immediately after you hear the startup sound.
    5. Hold these keys until the computer restarts and you hear the startup sound for a second time.
    6. Release the keys.
  3. CookieCarol thread starter macrumors newbie

    Sep 6, 2015
    This solved the problem!

    THANK YOU!!! You're the best! You saved my weekend, now I can get back to work.

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