3 screens showing on display propertise, yet i only have 2

Hi, I have a new dell optiplex 3050, that we have installed an amd radeon 7400 into. on windows 10
The system shows 3 monitors on the display settings. even thou we only have 2. the live screens are 2 and 3 on the picture.
We had an issue where a windows update went on and it looked like the login screen was on screen 1, which made life fun.

I have seen  few forums, I've updated the dell drivers, bios, etc and also updated the amd drviers. yet it still shows a 3rd screen
display propertises
total123Asked:
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Hello ThereSystem AdministratorCommented:
Reboot with shutdown -r -t 0 command.
Unplug all cables PC-monitor.

There might be a conflict between Intel HD and AMD graphics.
So first update the Intel graphics driver. If this won't help, try to rollback:
It seems to be an issue in the Intel HD Graphics driver. Installing previous version, more specifically 15.40.4.64.4256 (https://downloadcenter.intel.com/download/25150/Intel-Iris-Iris-Pro-and-HD-Graphics-Production-Driver-for-Windows-10-64-bit
Or just disable unused Intel HD Graphics in Device Manager.

Also if you see Generic Non-PnP monitor - update driver for this device.
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Justin EllenbeckerIT DirectorCommented:
You may also have to check in the BIOS if the system had integrated graphics and you are now using a card you will want to disable it n the BIOS to free up the memory it was using. There is usually an option to set the primary graphics adapter and disable the on board video.
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total123Author Commented:
I found I couldn't' get into the bios via the onboard card. I ended up taking the card out and could see the bios whilst using onboard video.
There was an option for auto video or intel onboard.

plugged video card back in and still couldn't get into the bios.
If i had a monitor plugged into the intel vga, it gave a window saying that i have a separate video card and to plug the cable into that. only option was to shut down. very strange.

I cannot disable the intel video under display adaptors, as it only lists the AMD one.
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Justin EllenbeckerIT DirectorCommented:
The system is auto disabling the onboard when the card is in which is good. The issue is what it sees that monitor as. There are times that some third party software, something like TeamViewer can add an extra display adapter that is hidden from the system.

In the properties window click on the monitor that is the "ghost" one and then scroll down and click on "Display adapter properties" this will tell us where it thinks this monitor is plugged into.

Try booting into safe mode and removing all display adapters and monitors and then reboot also. It could still be seeing the onboard for some reason.
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total123Author Commented:
I'll try that tomorrow.
On a side note. There wasn't any remote software on it, but as I wanted to play with it tonight, I installed my remote software.
That does allow me to see 3 screens remotely.

In device manager, it show 2 pnp generic monitors and 1 non pnp
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Hello ThereSystem AdministratorCommented:
Note: If you have both - integrated and dedicated graphics card, you have to use dedicated one.
You cannot use display ports (VGA, HDMI, DVI) on both if your MB doesn't support it.
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