1 Reply Latest reply: Jul 2, 2013 6:07 AM by sterling r
Jeremie nicoläe Level 1 (0 points)

Good evening,


I'd like to ask for information about a problem I have with my MacBook Pro 13" on Mountain Lion 10.8.4.

I bought a VGA to Thunderbolt adaptator to use with my projector. It has worked just fine during a week, but today as I was trying to project a meeting plan the computer simply didn't recognize the projector. I tried many manipulations without success.


Could someone help me to understand how to make it work again?


Thank you verry much

MacBook Pro (13-inch Late 2011), OS X Mountain Lion (10.8.4), Apple Remote
  • sterling r Community Specialists

    Hello Jeremie,


    I recommend a couple of steps. Resetting the PRAM and the SMC would be the best things to do here, assuming the computer has been shutdown (not restarted but shutdown) and then turned back on.

    Intel-based Macs: Resetting the System Management Controller (SMC)


    Resetting the SMC on portables with a battery you should not remove on your own

    Note: Portable computers that have a battery you should not remove on your own include MacBook Pro (Early 2009) and later, all models of MacBook Air, and MacBook (Late 2009).

    1. Shut down the computer.
    2. Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
    3. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
    4. Release all the keys and the power button at the same time.
    5. Press the power button to turn on the computer. 
      : The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.


    About NVRAM and PRAM


    Resetting NVRAM / PRAM

    1. Shut down your Mac.
    2. Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
    3. Turn on the computer.
    4. Press and hold the Command-Option-P-R keys before the gray screen appears.
    5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
    6. Release the keys.

    After resetting NVRAM or PRAM, you may need to reconfigure your settings for speaker volume, screen resolution, startup disk selection, and time zone information. If issues persist, your Mac's logic board battery (not a portable Mac's rechargeable battery) may need to be replaced. The logic board battery helps retain NVRAM/PRAM settings when your computer is shut down. You can take your Mac to a Mac Genius or Apple Authorized Service Provider to replace the battery on the logic board.


    Take care,