1 Reply Latest reply: Nov 30, 2013 9:35 AM by sterling r
megagaryrose Level 1 (0 points)

Hi, I have a 2008 imac computer which im trying to connect to my new phillips HD tv. I have bought a HDMI to mini dvi adapted, connected them to the right ports and no luck. The computer picks up the TV in detect displays but there has never been a picture on my TV, just the blue screen that appears when nothing is connected. Iv tried changing every resolution on the TV but still nothing. Is it my TV? Have I missed out some sort of setup?


Please help, Gaz

  • sterling r Community Specialists (6,550 points)

    Hello megagaryrose,


    It sounds like you have having difficulty in using your TV as an external monitor. I want to recommend trying these troubleshooting steps from the article named:

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


    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 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.

    Thank you for using Apple Support Communities.

    Take care,