The setup is thus: A friend has bought a new GPU and is complaining the computer is taking forever to start with it. He has already tested the GPU in another computer and it works fine. Putting his old GPU also makes the system work fine.

So i arrive at the scene, he turns on the computer, the computer and two monitors boot on, monitors are displaying blank black screen and nothing happens. We wait as per his instruction and some minutes later windows starts booting.

We do some basic troubleshooting and everything seems to be in order. At this point during one of those long boots i strt randomly clicking keyboard buttons in hopes for a reaction. Reaction comes when i press Enter, the computer boots almost instantly.

At this point i notice that the GPU output has three cables plugged in, while there are only two monitors. The third one traces its way to the TV. The friend confirms that he sometimes uses TV as a display.

I tell him to turn on the TV and we restart the PC again. And here we see the issue. The guy has dualboot setup and the computer is asking which OS to boot into, but for some reason choosing the third display to do that. After 180 seconds it autoselects the first boot, OS loads with a 3 minute delay.

Once boot is selected OS correctly identifies the primay monitor and uses it to show loading, before that it decides to use the TV for some reason. The solution was to switch the ports on a GPU for the monitors.