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Computer monitor has flashing horizontal lines when power supply is connected

Discussion in 'Hardware' started by LSK, Mar 3, 2011.

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  1. LSK

    LSK Thread Starter

    Joined:
    Jun 24, 2007
    Messages:
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    This happens: http://www.youtube.com/watch?v=IfY4A8gQ1bE

    The horizontal lines disappear shortly after removing the power supply, and come back when it's reconnected.

    Observations and steps taken:

    - The computer has been connected to multiple power supplies in different rooms. This behavior happens regardless of the power supply.

    - This doesn't start right away when the computer boots up - only after some time.

    - It also doesn't seem to happen in safe mode, but I haven't tested it under heavy processor load in safe mode.

    What is happening? What steps should I take?
     
  2. LSK

    LSK Thread Starter

    Joined:
    Jun 24, 2007
    Messages:
    8
    A system restore resolved this temporarily, but the Windows Update which installed immediately afterwards caused it to start happening again.
     
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