1 Reply Latest reply: Nov 14, 2013 6:41 AM by jeremy_v
hayesjdr78 Level 1 (0 points)

Recently my cable i use for my TV stopped working and i can't sort out why. when connected, my computer goes blank (black) and yet if a video is playing i can hear it. problem is i cant seem to get out of the black screen even if i disconnect from the TV. i have to shut down the computer manually because it seems to be stuck. what could it be??? bad cable? bad port? i do not leave my computer connected all the time, so could it be plugging and unplugging the cable from the computer? it worked simply for the longest time so i can't imagine what happened. i heard maybe a mini DVI/HDMI adapter on my computer might be a good idea too. please advise.

  • jeremy_v Community Specialists

    Hi hayesjdr78,


    Thanks for visiting Apple Support Communities.


    If you no longer see video when connecting your Mac to your TV, try these steps first:

    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 systemYou 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.


    The full article has more information that you may find helpful:


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