Blue/ green lines

When I turn on my Promethean boards it only shows blue & green lines across the screen. 


  • Hi hartmanj,

    Thank you for posting to our Support Community. 

    Can you please provide us with the Model number for your Promethean hardware so that we may be able to offer more specific troubleshooting steps?

    For now, we would suggest the following:
    - Test with as new or known working video cable (HDMI or VGA)
    - Test with another known working source 
    - Test another connection port on the hardware 

    Kind Regards,
    Promethean Technical Support

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