Windows 10: Suddenly can't use monitor unless the others are powered off

Latest NVidia driver 551.23 might have broken some things for my computer. I have three displays plugged into my graphics card RTX 2070 Super-- a TV via HDMI, and two monitors via display port. They've always worked fine in conjunction, until today when it randomly stopped. Also, today was the day I installed the new driver, which is a strange coincidence. My second monitor now says "no display connected", but my computer shows all three monitors in display settings, and constantly stutters as if it's constantly connecting and reconnecting to the second monitor. However, the second monitor

:)

 

Power plan?

Upon checking, it seems that there's nothing wrong with your system. It is usual that you have to double-click your mouse before your monitor wakes up.

For the meantime, we suggest changing the power plan by following the steps below:

• Press Windows key + S.
• Type in Power Settings.
• On the pop-up window, choose Additional power settings.
• Select High performance.

After changing the power plan, we suggest that you monitor the changes made and check if that will work for you.

Get back to us if you need further help.

 

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

 

2nd Monitor suddenly not working

Hi Michael,

If you recently updated from one version of Windows to another, it's possible that the current driver is for the previous version of Windows. For us to troubleshoot your monitor issue, we suggest performing these steps:

• Run the troubleshooter for devices and hardware. The troubleshooter will perform a diagnostic process on your system that will check and resolve issues related to
  using your device.
• Update your monitor and display driver. To update a driver, refer to this
  link. If Windows doesn't find a new driver, you can try checking for one on your device manufacturer's website.
  

Get back to us with the result.