francesfromhamilton
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Q: Mirroring

My MacPro sometimes doesn't mirror to our Panasonic TV. I connect the TV to my Mac using an HDMI cable and adapter that I bought at the Apple store. As I said sometimes it works and sometimes it doesn't.

 

Thanks

MacBook Pro, Mac OS X (10.6.7)

Posted on Apr 25, 2015 10:28 AM

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francesfromhamilton

Q: Mirroring

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  • by pedro d,

    pedro d pedro d Apr 28, 2015 10:53 AM in response to francesfromhamilton
    Community Specialists
    Apr 28, 2015 10:53 AM in response to francesfromhamilton

    Hello there, francesfromhamiliton.

     

    When troubleshooting issues with an external display, the following Knowledge Base article provides some great in-depth steps to try:

     

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

     

    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.

     

    For a good overview of Video Mirroring, Extended Desktop features, this article can be useful as well:

     

    OS X: How to use multiple displays with your Mac in Mountain Lion and earlier - Apple Support

     

    Thanks for reaching out to Apple Support Communities.

     

    Kind Regards,

    Pedro.