I am trying to extend my desktop to a second monitor. Let me first explain some details because my situation is not like the others. First of all, it was working and suddenly it stopped. Also, according to the Windows 10 OS, my drivers are all updated.

I am also able to reboot and have the system work with either monitor and looked into either port on the video card.

Please advise. I downloaded display fusion, but I do not think it will help since I assume the software is dependent on existing system settings.

Yes, I know how it is supposed to work with the display settings, but I can not get the operating system to recognize the existence of two monitors.

As you note, this isn't a DF issue. If the OS isn't recognizing the second monitor, DF isn't going to recognize it.

You have a discrete video card or are both monitors connected to onboard graphics? Or one monitor to each?

"As you note, this isn't a DF issue. If the OS isn't recognizing the second monitor, DF isn't going to recognize it."

It still might be something you can get kudos for assisting in. There was another discussion thread that I wanted to join but I think it is already closed. The participants seemed to have similar issues.

https://www.displayfusion.com/Discussions/View/windows-10-does-not-recognize-second-monitor/?ID=80c0db96-297e-4798-9e04-dcb05ebe1409

"You have a discrete video card or are both monitors connected to onboard graphics? Or one monitor to each?"

There does not seem to be a graphics connection on the motherboard and so all connections to the monitor or monitors comes from the graphics card.

I did a number of tests. I have confirmed that both monitors work. I have also confirmed that either connection on the graphics card will be accepted by the OS at start up. So I am puzzled.

Also, the entire system was working perfectly and suddenly stopped.

Does this give you any ideas of where to look now and what action I should take?

When you go into Screen Resolution (or whatever the equivalent is in Win 10), does it show only one monitor or does it show the both, with the second monitor as disconnected?

Also, do you have software (not just the driver, but software to control settings) for the video card installed? If so, when you open the software, what info does it show pertaining to attached displays?