Windows 10: windows update 10/12/2020 knocked out second monitor.

I have reinstalled graphics card, uninstalled the windows update, restarted multiple times, switched off and on both monitor and pc, tested the hdmi cable, nothing works. How can I get my monitor back?

:)

 

Windows 10 Update

Well just noticed a pretty large one pop up coming in at 914MB, seems it makes some pretty serous updates.

KB3172985
https://support.microsoft.com/en-us/kb/3172985

This security update includes improvements and fixes in the functionality of Windows 10 Version 1511 and Windows Server 2016 Technical Preview 4. It also resolves the following vulnerabilities in Windows:

• 3175677 MS16-094: Security update for secure boot: July 12, 2016
• 3174060 MS16-093: Security update for Adobe Flash Player: July 12, 2016
• 3171910 MS16-092: Security update for Windows Kernel: July 12, 2016
• 3170048 MS16-091: Security update for .Net Framework: July 12, 2016
• 3171481 MS16-090: Security update for Kernel Mode Drivers: July 12, 2016
• 3170050 MS16-089: Security update for Windows secure kernel mode: July 12, 2016
• 3170005 MS16-087: Security update for the Microsoft Print Spooler: July 12, 2016
• 3169999 MS16-085: Cumulative security update for Microsoft Edge: July 12, 2016
• 3169991 MS16-084: Cumulative security update for Internet Explorer: July 12, 2016

 

Second monitor not detected after update

Hi Tom,

There are several reasons that could have caused the issue you are experiencing. One of these is the update you previously performed in Windows, either it was not configured properly by the system or the update components were corrupted. Kindly answer the
following questions for clarification:

• Have you tried updating the monitor and display drivers?
• Have you tried to use another user profile to check if the issue re-occurs?

Furthermore, we suggest that you add the other monitor manually. This is to ensure that the second monitor is still connected after the update. Here are the steps:

• Type connected devices and open Connected Devices on the
  Windows Search bar.
• Click Add devices.
• Select the Second screen.
• Pick one of the 3 options: Duplicate, Extend, and the Second screen only.
• The Duplicate option will duplicate the primary display to secondary display.
• The Extend option will unite two monitors so you can use them both as one.
• The Second screen only option will, obviously, disable primary and use only the secondary monitor.
• Once you’ve chosen the preferred mode, save changes.

We're looking forward to your response.

 

Error: No signal on second monitor after upgrade to Windows 10

Hi,

Thank you for posting in Microsoft Community, we appreciate your interest in Windows 10.

I understand your inconvenience caused to you with accessing the second monitor, we will help you with this issue.

This issue might have occurred due to outdated/ corrupted drivers.

As you have already tried to update the drivers and issue still persists, I suggest you to uninstall the existing drivers for second monitor and re0install them from the manufacturer's website.

Step 1: Steps to uninstall the drivers for the Display Adapter.

• Press Windows key + X key when you are at desktop.
• Select Device Manager.
• Expand Display Adapter.
• Right on the Display Adapter and click on
  Uninstall.
• Restart the computer.

Step 2: Also, contact the manufacturer's website and try to install those drivers for your device.

You can install Windows 8/8.1 drivers in compatibility mode if there are no Windows 10 compatible drivers.

Follow the steps to install in Compatibility mode:

• Download the updated driver from the manufacturer’s website.
• Right click the driver installation file and select
  Properties then tap or click the Compatibility tab.
• Place a check in the Run this program in compatibility mode for: box.
  
• Tap the drop down box and select a previous operating system, then tap or click
  OK.
• Try installing the driver and check.

To know more about this issue, I suggest you to refer to the article by
Andre Da Costa and check:

How to add and use a second monitor with Windows
10

Hope it helps. Kindly let us know if you need further assistance with Windows Operating System. We will be glad to assist you.