Windows 10: Fix Monitors Turning Off Briefly After System Startup SDC_FORCE_MODE_ENUMERATION...

Here’s an instruction, not a question.I encountered an issue where my monitors would briefly turn off for one second right after the system booted up. The system loaded to the desktop, and after about two seconds, both monitors went black I’m using a dual-monitor setup.In the Event Viewer Event Viewer > Windows Logs > S

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When I turn on my second monitor my first monitor turns off briefly

I recently had an issue with my PC regarding a Windows Update. I was getting annoying errors in the Event Viewer and ended up using a System Restore. Everything seems to be okay now, except for one thing: When I turn on my second monitor, the first monitor goes off briefly, and then comes back on as soon as the second monitor turns on. (And the opposite happens: if I turn the second monitor off, the first monitor goes off as well, then pops back on). This never happened prior to the system restore. Any idea how to fix that? I have tried to google this problem but I get a lot of mixed and unrelated results. I'm running Windows 10 Home. My main monitor is an Alienware AW2721D and my second monitor is an old NEC EA231WMi. Both use display ports on my 3080ti graphics card. All other specs are listed in my profile if needed. Edit: I also have the latest nVidia drivers as of today.

 

When I turn on my second monitor my first monitor turns off briefly

I really appreciate the response. However, my main monitor never used to shut off when turning on my second monitor. I don't know why it's doing that. I'm wondering if I changed a setting somewhere. It only started occurring after I did a System Restore, and before that the main monitor always stayed on, (unless I turned off my second monitor, and the main one would turn off but very briefly). - - - Updated - - -

What do you mean when you say "the video will have to readjust to some resolution that is common to both of them"? Which Display Properties would I find this under? Within Windows or in the Nvidia Control Panel? One thing I just realized is the monitor drivers are both listed as Generic PNP. I guess I should fix that...

 

When I turn on my second monitor my first monitor turns off briefly

The video card at one time can only generate one resolution and refresh rate. Each of your two monitors have different capabilities. The computer knows what these capabilities are so has to find one resolution and refresh rate that is common to both monitors. That is what it has to use when both monitors are connected. With both monitors connected note what the display resolution and refresh rate the Alienware monitor has changed to. If that seems OK disconnect the 2nd monitor. Then manually change the Alienware monitor display resolution and refresh rate to the values you noted previously. Now connect the 2nd monitor again and see if you still see the flashing.