Windows 10: Monitor only shows half

My monitor shows only half when I booted it today. On the bottom part all I can see is blank and nothing is in there you cant even hover the mouse or the mouse will be gone when you hover it. When booting the PC, the display shows in full but not until you get to main screen. It is hard to work this way, please help me.

:)

 

Monitor - half of it is black

Running w10 and up to date as of June 7/20. Running 3 monitors. Middle one (NEC 3090WQXi large screen) only has half a screen showing. Done settings, monitor, checks. All scaling and resolution is correct. Uninstalled drivers for that monitor and for video
card and rebooted. No change. Unplugged and reseated video cable. No change. Unplugged power cable to monitor. Let it sit half an hour, plugged it back in, and then got full screen. Left it alone, screen saver came on, woke it up, and back to half a screen
(left half black). Repeated unplug and leave it, but now still at half a screen. All diagnostics in device manager say monitor is working properly - sadly not. The setup has been working well for ten years. Not sure if this is a result of them latest W 10
update. The one thing I have not tried is to roll back the latest update - I hate doing that in case it causes more problems.

I have run out of ideas. Any suggestions? Apologies if it is in the wrong section. There was no option for display issues.

 

Overclocking / Undervolting guide for Vega 56 or 64?

Here's a quick laundry list:

List of software to use for overclocking and testing
Examples:
Wattman (and how to find and use it, like an overview, including profiles)
Unigine Valley or Heaven (use this for quick testing while changing settings in Wattman and checking for stability / artifacts) ...just suggesting this
How to monitor cores / mem speeds and temps during testing (I've seen screen overlays, and others using GPUz)

Step-by step overclocking in Wattman
Fan speeds
Power limit
Temp limit
Voltages
Core speeds
Memory speeds

 

Windows 10 External Monitor only :: How to set Portrait orientation?

Thanks Elise,

I found more links which suggest

1. turn one of the monitor
   
2. feedback to Microsoft
   

Using Steps Recorder on Two monitors. (microsoft.com)

How to limit Problem Steps Recorder to single - Microsoft Community

I need assistance on both suggestions; how to

1. turn off laptop monitor?
   
2. locate feedback hub on Cortana?
   

My workaround is to use PowerPoint Screen Recorder but this need additional screen capture.

The reason for Screen Recorder is Windows 10 Mouse Cursor for Office Menu item disappear when select Screen Capture App. It is cumbersome to show Tech Support what is selected on Office App on captured screen...

Thanks Ahead!