1 Reply Latest reply: Aug 21, 2013 7:09 AM by sterling r
alley-cat Level 1 Level 1

I have a Macbook Pro (osx Lion) and I can not connect it to my tv. I am using a mini display port to HDMI adapter to connect to my Insignia TV. Whenever I connect it the screen on my laptop goes blue for a second but nothing shows up on the TV. When I check for displays nothing happens and the TV says no signal. I have tried using other cords and have had the same result. When I try to use the same cord and adapter on a different TV it works just fine. The TV model is an Insignia LCD TV NS-L22Q-10A. Please help, I have tried various methods and still can not get it to work.

MacBook Pro (13-inch Early 2011), Mac OS X (10.7.5)
  • sterling r Community Specialists Community Specialists

    Hello Alley-cat,


    Thank you for using Apple Support Communities!

    I found an article to assist with troubleshooting external displays connected to your mac that should prove helpful.

    Named Apple computers: Troubleshooting issues with video on internal or external displays you can find it here 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 resolutionStart 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.


    All the very best,