how to reconnect laptop to external monitor when it does not detect the external monitor?

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  • ?
    Lv 7
    6 months ago

    turn the monitor on, connect the cable between both devices, and restart the computer.

    if it doesn't work, it is a bad cable or a bad connector on one of the 2 ends.

  • 6 months ago

    Depending on the make and model, some laptops will only detect an external monitor during boot up.  When the laptop boots if there is no monitor attached, it will disable the monitor port to save power.  You may need to power the laptop down, attach the monitor, make sure the monitor is on, and then restart the laptop.

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