Windows 10: 2nd monitor not detected after windows update.

Discus and support 2nd monitor not detected after windows update. in Windows 10 Installation and Upgrade to solve the problem; Updates have been wreaking havoc on my computer over the last few months. In a couple of cases I was able to regain normal operation by rolling back... Discussion in 'Windows 10 Installation and Upgrade' started by RAClay, Dec 11, 2018.

  1. RAClay Win User

    2nd monitor not detected after windows update.


    Updates have been wreaking havoc on my computer over the last few months. In a couple of cases I was able to regain normal operation by rolling back the update via system restore. However, twice now including today the update has left my computer (HP Pavilion laptop) unable to detect the second monitor, and restoring the system didn't help. Neither did updating the display adapter driver, clicking Detect in display settings, pressing Win Key/ P for multiple monitor mode adjustment, or anything else I found suggested in various forums.


    The solution in my case was hinted at by a couple of lines in the installation guide for my Acer monitor:

    " 1. Turn off your monitor and unplug your computer's power cord."

    ... [hook up all cables] ...

    " 4. Power-ON the monitor first, then power-ON the computer. This sequence is very important." (emphasis added)


    Since I'm using a laptop, I took out the battery as well. Waited a bit & pushed power button a few times. Then put the battery back in, plugged in cables and power cord, powered up the monitor first and then the computer, and now all is normal again.

    Hopefully this helps someone else. I guess somehow that ritual flushes all the old bits and the computer views the monitor as a virgin...


    If anyone knows what's up with the need for complete un-powering and the start-up sequence, please enlighten. 2nd monitor not detected after windows update. :)

    :)
     
    RAClay, Dec 11, 2018
    #1

  2. 2nd monitor not being detected

    Received a software update for windows 10. Upon restart my 2nd monitor was no longer working. Went to the display section in Settings and it is not being detected. Pushed the detect button and nothing. How do I get this back. My 2nd monitor is more
    important than any new things in the update.
     
    TomKlein28, Dec 11, 2018
    #2
  3. Windows 10 stopped detecting 2nd monitor

    I've restarted the computer (several times), and it's not showing any signs of detecting the 2nd monitor.

    Ever since it stopped working, there's only '1' Display option; clicking 'Detect' in Multiple displays results in the message
    "Didn't detect another display"; the Device Manager only lists one monitor (screenshot below); and it has stopped allowing me to select other projection modes unless I connect to the 2nd monitor wirelessly.

    I'm using an HDMI cable for the 2nd monitor, and have tried both HDMI ports on the monitor unsuccessfully. The monitor models are Dell E2414H and LG 24J4840.


    2nd monitor not detected after windows update. af424300-686f-4026-b2e7-f1ba3cdbde9a?upload=true.jpg


    Save
     
    ChayaCooper, Dec 11, 2018
    #3
  4. 2nd monitor not detected after windows update.

    2nd Monitor not detected

    I have same problem. Last night windows 10 did what was listed as the winter update. Since then my second monitor just mirrors the first monitor. Everything worked until the update. I have tried several things, booting with just the one monitor (ASUS)
    and delecting the first (ACER) and then adding both monitors, the control panel just sees the acer monitor. When I ask to detect second monitor it says second monitor not detected. I tried several different resolutions, that didn't help either. The same
    screen appears now on both monitors, but control panel senses only the acer monitor.
     
    SherilBurton, Dec 11, 2018
    #4
Thema:

2nd monitor not detected after windows update.

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