Today's graphics cards come with multiple digital Display Port and HDMI connection ports, although older ones still incorporate analog VGA (D-Sub15) and digital DVI-D or its digital/analog counterpart DVI-I. Normally there should be no problem connecting multiple displays or monitors to any of these ports. In the operating system you can configure which screen will be 1 and which will be 2, 3, etc., regardless of the ports they are connected to. This order should also be followed when starting the PC, but this can change for any reason. For example, it is possible that from one moment to another you have the problem that the boot screen, boot (when the mainboard logo appears) or the BIOS setup screen appears on a secondary monitor and not on the main one..
The misconfiguration problem in the priority that the system gives to displays may be due to the likely implicit boot order in VGA > DVI > HDMI > DP video cards, which prioritizes analog or older video outputs over digital ones or more modern. This is quite annoying, because normally we will always prefer to connect our main monitor to the Display Port port that offers better support than HDMI for high refresh rates and resolutions.
Be that as it may, in my PC settings I have found what I think is considered the priority order of the ports by my Nvidia video card, and it is largely contrary to what was said in the previous paragraph..
Right click on the desktop screen and select “Nvidia Control Panel”. In the left side panel click on “Set digital audio”. There you will find the available ports on your video card. The first port is supposed to be the priority and that is where you should connect your main monitor. If the main monitor is in another port, disconnect and change the port until you see on the screen that it is connected to port #1.
If you don't have the indicated option, install Nvidia Control Panel from the Microsoft Store . You may also need to update your graphics card drivers..
According to this information, on my RTX 2080 video card, the priority port is the Display Port that is on the right (as viewed from the rear of the chassis) and the ones next in order are the ones that are located towards the left. , that is to say HDMI, DP2, USB C and finally in the lower row the DP3.
Apparently the priority of the ports cannot be changed. The screens are the ones that must be connected according to the order established in the video card.
Initial Display Output in BIOS
If the screen misconfiguration persists, you might want to try this option, which is called that in Gigabyte BIOS and may have a similar name in other brands. This function specifies whether to use the CPU's integrated graphics (IGFX) or dedicated video card (PCIe Slot). Switching between these options may cause the behavior to "reset". Doing this brought the boot screen back to my primary monitor, but the problem was that I had to keep my secondary screen unconnected.
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