Question Second Monitor only recognized during startup

[Ryzane]

First, my PC specs:
MB: Asus Prime B350-Plus
CPU: Ryzen 5 3400G (with Radeon Vega 11)
GPU: GeForce GTX 1050 Ti
OS: Windows 10 Home 64bit

I had used a TV as my display for a few years until I bought a proper monitor (Acer KG241Q). That TV was, and still is, connected to my graphics card via HDMI and the new monitor is connected to it via DisplayPort. I haven't used the TV since I bought the monitor but want to use it as a second monitor now. However, my PC wouldn't recognize the TV when I turned it on while the PC was running, so I tried rebooting while the TV was turned on and found out that it does get recognized during startup (if I head into BIOS, that'll be shown on the TV as well), but as soon as Windows starts, the TV goes 'no signal' and the video signal switches over to my monitor instead. If I do the same while having the monitor turned off, there still won't be any signal on the TV.
At least this ensures me that there's no problem with the hardware connection between the GPU and the TV.

Of course I have already tried the 'detect display' options in Windows Settings and NVIDIA Control Panel.

I know that there's a BIOS setting that allows the iGPU and graphics card to be used for display output simultaneously, but the last time I tried switching it on, my PC wouldn't boot and I don't remember how I got it to work again, so I'm kind of scared to try that.

Any help from you would be much appreciated. Feel free to ask if I forgot to mention any details.

 

[Ralston18]

This GPU?

https://www.newegg.com/msi-geforce-...Vg4TICh0LCQuEEAQYAyABEgIYhfD_BwE&gclsrc=aw.ds

On the GPU you are connecting the GPU's DP port to the new monitor and continuing to connect the GPU's HDMI port to the TV as a second monitor correct?

Look in Device Manager (ensure that "Show hidden devices" is checked via the View tab.)

Do both the new monitor and TV appear in Device Manager?

= = = =

Does the following link provide the applicable User Manual for your motherboard?

https://dlcdnets.asus.com/pub/ASUS/...E13723_PRIME_B350-PLUS_UM_V3_WEB_20171114.pdf

As for mentioned iGPU "switch" my thought is that you probably disabled that if disabling is indeed is an available option within BIOS.

Take a look in BIOS but just look being careful not to change anything. Try to find or identify the setting again.

Use Chapter 2 of the User Manual to guide yourself around and make notes on what you find.

Again - be careful not to change anything.

 

[Ryzane]

This GPU?

https://www.newegg.com/msi-geforce-...Vg4TICh0LCQuEEAQYAyABEgIYhfD_BwE&gclsrc=aw.ds

On the GPU you are connecting the GPU's DP port to the new monitor and continuing to connect the GPU's HDMI port to the TV as a second monitor correct?

Look in Device Manager (ensure that "Show hidden devices" is checked via the View tab.)

Do both the new monitor and TV appear in Device Manager?

= = = =

Does the following link provide the applicable User Manual for your motherboard?

https://dlcdnets.asus.com/pub/ASUS/...E13723_PRIME_B350-PLUS_UM_V3_WEB_20171114.pdf

As for mentioned iGPU "switch" my thought is that you probably disabled that if disabling is indeed is an available option within BIOS.

Take a look in BIOS but just look being careful not to change anything. Try to find or identify the setting again.

Use Chapter 2 of the User Manual to guide yourself around and make notes on what you find.

Again - be careful not to change anything.

Yes, that is the GPU and how I connected the displays to it.

In device manager, there are three devices called "Generic PnP Monitor", two of them hidden, their device status says:
"Currently, this hardware device is not connected to the computer. (Code 45)

To fix this problem, reconnect this hardware device to the computer."

That MB manual is the correct one, and the BIOS setting I meant is Advanced>NB Configuration>IGFX Multi-Monitor. It is currently set to Disabled and can be set to either Enabled or HybridGraphics.

 

[Ralston18]

Next look in Reliability History for any entries that correspond with the problems you describe. Especially any that involve Code 45.

Code 45:

https://windowsreport.com/fix-hardw... device is,device drivers, or faulty hardware.

[Note: do not download any "repair tools" etc., do registry edits, etc..]

Focus on the drivers.

Acer Monitor:

https://community.acer.com/en/kb/articles/117-downloading-and-installing-drivers-for-acer-products

https://www.acer.com/ac/en/US/content/drivers

Check if there are specific drivers available for the new monitor and, if so, manually download, install, and configure.

 

[Ryzane]

Next look in Reliability History for any entries that correspond with the problems you describe. Especially any that involve Code 45.

Code 45:

https://windowsreport.com/fix-hardware-device-not-connected-error-45/#:~:text=Code 45 Hardware device is,device drivers, or faulty hardware.

[Note: do not download any "repair tools" etc., do registry edits, etc..]

Focus on the drivers.

Acer Monitor:

https://community.acer.com/en/kb/articles/117-downloading-and-installing-drivers-for-acer-products

https://www.acer.com/ac/en/US/content/drivers

Check if there are specific drivers available for the new monitor and, if so, manually download, install, and configure.

I had a look at that site, Windows is up to date, sfc and dism did not find or fix anything, searching for new drivers in device manager didn't work and the only "driver" available for the monitor is an .icm profile. The reliability history does not show anything that might be related to this issue.

 

[Ralston18]

You could try the .icm profile for the monitor. Just as matter of elimination.

Technically, with the problem being an unrecognized/ "no signal TV, color tweaks etc. may not appear applicable. However, strange things do happen.

Reading back, I realized that I did not ask what make and model TV?

 

[Ryzane]

Already applied the .icm profile, no effect. The TV is a Grundig 32 GFB 6728.