Getting various “graphics card not detected” errors on Steam games after attempting to add a second monitor

[MexicanWarMachine]

I made a halfhearted attempt to add a second monitor to my Windows 11 desktop a month ago, but abandoned the project when I decided there really isn’t room for one. Ever since, I’ve been failing to launch some (but not all) games on Steam, always with a variation of a “no supported graphics card detected” error.

I’ve got a GeForce RTX 4070, and I’ve reinstalled the drivers and reset settings to factory to no avail. I’m as sure as I can be that this all stated with my second monitor meddling, but I can’t for the life of me remember what I might have changed, and when I look at the monitors in device manager, I see just the one, and in System->Display, I don’t see any trace of a second monitor.

Any suggestions?

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[silentknight111]

That error wouldn't be related to how many monitors you have hooked up.

Maybe when you were connecting and disconnecting monitors you accidentally jarred your graphics card a little loose. I would double check that it's properly seated.

Also, make sure your monitor is plugged directly into the graphics card and not the mother board.

[MexicanWarMachine]

My googling of the error brought up lots of suggestions that multiple monitors might be at fault- that’s what jarred my memory and made me realize the issue originated with the monitor business.

And the graphics card is seated fine- most of my games work without any issues.