jswilliams
Level 1 (0 points)

Q: MacBook Air No Signal

Hi

 

Have a MacBook Air Mid 2012 and a Mini Display Port to DVI adaptor.

 

When I connect to my monitor my monitor just says no signal however the Mac sees it.

 

When I connect a PC via DVI the monitor works fine.

 

When I connect the Mac to my much older monitor via DVI it works fine.

 

Any ideas?

 

The display that the Mac is having issues with is an LG D2342P

AppleTV 2, Mac OS X (10.7.3)

Posted on Jan 28, 2014 1:15 PM

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jswilliams

Q: MacBook Air No Signal

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  • by jeremy_v,

    jeremy_v jeremy_v Jan 30, 2014 12:05 PM in response to jswilliams
    Community Specialists
    Jan 30, 2014 12:05 PM in response to jswilliams

    Hi jswilliams,

     

    Thanks for visiting Apple Support Communities.

     

    I recommend checking the following information and troubleshooting steps if the issue seems to be isolated to one monitor and your MacBook Air:

     

    Apple computers: Troubleshooting issues with video on internal or external displays

    http://support.apple.com/kb/ht1573

    No video or no signal, image distortion, "snow," or flickering

    Check connections

    When using an external display be sure to check the following:

    1. If you're using an Apple notebook, confirm the AC power cable or adapter is securely connected to the computer and the cable providing power to the display is also secure. It is always good to have your notebook connected to AC power when an external display is in use.

    2. Confirm display adapters are fully seated in their respective connections and that they are supported models and for the computer and display. Refer to these articles to assist you with adapter compatibility and further configuration information:

    3. Remove all display cable extenders, KVM switches, or other like devices and retest to determine if the issue is resolved.

    4. Try unplugging the video adapter or cable and then plug it back in.

    5. If more than one video adapter is in use (or "daisy-chained"), troubleshoot by using only one adapter.

      • Example: A mini DisplayPort to DVI adapter connected to a DVI to HDMI adapter is an unsupported configuration because there is a series of adapters in use.

    6. If available, try using a different display and or adapter (or use a different connector by using DVI instead of VGA, for instance).

    Reset the system

    You can reset the Mac's parameter RAM and SMC.

    Reset the resolution

    Start by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:

    1. Start up in Safe Mode.
    2. From the Apple () menu, choose System Preferences.
    3. Choose Displays from the View menu to open the preferences pane.
    4. Select any resolution and refresh rate that your display supports.
    5. Restart your computer.

    Cheers,

     

    Jeremy