Windows 10: I just got a second monitor to connect to my laptop, but now the first one appears much...

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Second monitor appears pixelated sometimes

Before we get started, here might be some setup information that may be worth noting. My primary monitor is a 1080p, 1920 x 1080 (native) using an HDMI to DVI. My secondary monitor is a SONY TV 1360 x 768 (native) using an HDMI. Both are connected to my graphics card and not the motherboard. I have always had this setup but I have not always had this issue.

Preforming the following actions may cause my second monitor to appear pixelated.

• Getting a web browser out of maximized mode by click dragging the window or using the restore button
• Using full screen on the secondary monitor
• Dragging a window into the second monitor, sometimes

In order to temporarily solve this issue I must apply a change to any display using the Nvidia Control Panel. Using the Windows display settings to apply a change does not always fix the issue. Also note that after the second monitor goes pixelated, my computer does not detect a change in any display's resolution settings.

So far I have tried the following fixes to no avail

• Keeping display drivers up to date
• Using a DDU to wipe display drivers clean and start anew
• Using the Hardware and Devices troubleshooter

I have tried to use capture software to screenshot the pixelation but it can not see it. I have to use a camera to show what it looks like instead.
Before:



After:




Capture software is not capable of detecting the pixelation so I have recreated what it looks like on screen. Use this as reverence if the pictures look bad.
Before:



After:

 

Windows 10 does not recognise second monitor

Hi Raffaele,

For us to sort out this problem with your dual monitors, we'd like to gather more information about what happened so we can address the issue appropriately. Below are a few questions we'd like to ask:

• Does the monitor on the laptop work if you disconnect the other monitor?
• Is the second monitor connected to the laptop using a DVI, HDMI, or DisplayPort cable?

While waiting for your feedback, we suggest that you disconnect the second monitor from the laptop and check if its own monitor is working. If not, restart the laptop and check again.

Update us with the result.

Regards.

 

Windows 10 does not recognise second monitor

• Does the monitor on the laptop work if you disconnect the other monitor?
  • No. It only works if I disable the driver so that it reverts to the Basic Microsoft driver. But then it will not connect to the external monitor.
  • Driver details for Intel(R) HD Graphics 520
    • Driver version: 21.20.16.4505
    • Driver date: 19/08/2016
  • 
    I also tried to update this driver to no avail so I rolled it back.
    
• Is the second monitor connected to the laptop using a DVI, HDMI, or DisplayPort cable?
  • It is connected via an HDMI cable.
• 
  Is it possible that the update/roll back process left remnants of the program in the Registry etc and these are interacting in a way to stop the proper functioning the graphics? Just a thought. When I did the update it asked me if I wanted it installed in
  the existing drivers folder? I said yes. Was this the right thing to do?
  
• When I disconnected the screen as you asked the laptop display remained blank. Restarting had no effect. As I said above, at the moment the only way I can activate the laptop display is disable the Intel driver and revert to the Microsoft Basic Driver but
  then I can't connect to the external screen.