Windows 10 will not detect my second monitor; it only detects a specific one.

[Unpolarize]

My dual monitors worked up until recently when I plugged all of my cables back into my computer and logged in. My monitors are both plugged into my video card via DVI connection. I switched cables, plugged them into different ports, and tried plugging only the monitor that doesn't work, but nothing worked.

I tried about everything. I first updated my AMD drivers to the latest build, but that didn't solve it. I rolled back my drivers, but nothing. I then did a fresh install of my drivers with DDU about 5 times. Every time my drivers were uninstalled using DDU, my PC duplicated the output to both monitors. This makes me think that all cable connections are secure and working. However, before I installed my drivers again, I tried to detect a second monitor in Display Settings, but It would not detect another display. This made me think the problem was related to Windows 10, so I just went ahead and did a fresh install of Windows.

Before doing a fresh install of Windows, I uninstalled my drivers using DDU. This duplicated my displays, so I only left the monitor that doesn't work plugged in, which worked by itself. However, after doing a fresh install of Windows 10 with only this monitor, I found something interesting. Since it was an older build of Windows 10 from my installation disc, I was able to access the old "Display" settings in control panel that got removed in future updates. This older setting in control panel actually labels the name of the monitor plugged in. Oddly enough, It labeled my monitor (the one that didn't work) as the other monitor I left unplugged during the entire fresh install of Windows 10.

 

[The Paladin]

alright, if 1 monitor works, and using the same cables(video and power) as that monitor and you plug your other monitor to it:
then I will question you by asking does it turn on ?
does it display anything on the screen?
is it possibly looking for a signal on HDMI while your plugged into dvi (ie press the menu button of your monitor do you get one?

everything you mentioned so far indicate a monitor issue not a video card issue.

to test video card you can use the same cables (video and power) with the working monitor and boot, if it recognizes that monitor then its not the video card the issue.


just to be clear.... MA, CA, PA (monitor A, DVI Cable A, and Power Cables A) work? then use Monitor B using CA and PA , does it work if not its not your video card the issue but your monitor, may it be a dead monitor or just not set to the right video input is another matter

 

[Unpolarize]

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[Unpolarize]

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[Unpolarize]

alright, if 1 monitor works, and using the same cables(video and power) as that monitor and you plug your other monitor to it:
then I will question you by asking does it turn on ?
does it display anything on the screen?
is it possibly looking for a signal on HDMI while your plugged into dvi (ie press the menu button of your monitor do you get one?

everything you mentioned so far indicate a monitor issue not a video card issue.

to test video card you can use the same cables (video and power) with the working monitor and boot, if it recognizes that monitor then its not the video card the issue.


just to be clear.... MA, CA, PA (monitor A, DVI Cable A, and Power Cables A) work? then use Monitor B using CA and PA , does it work if not its not your video card the issue but your monitor, may it be a dead monitor or just not set to the right video input is another matter

Despite being somewhat tech savvy, I made an embarrassing rookie mistake My DVI cable was the culprit. When I had previously switched out my DVI cable before, I did so while my computer was still on. It just took a quick reboot of my computer. I'm guessing my DVI cable was not communicating with my PC properly.