How to set monitor priority?

Question

Iron

Worth hdmi monitor (1). I decided to add an old vga to it via dvi (2). When connecting 2, it becomes the main one. When disconnected, everything falls into place. Monique 2 is old and takes a long time to start. You need to make hdmi the main one, regardless of dvi, because there are several systems: you don’t want to poke at random into grub.
upd:
I don't specifically need OS, but in general.
So that from the very start the PC monitor-1 is the main one. For, as I wrote in the question, monitor-2 is old and takes a long time to start, and, for example, grub asks you to select the axis on the main monitor.
upd2:
Maybe through firewood you can somehow edit it?
Card - asus geforse gtx560 directcu 1gb 5ddr. Firewood from nvidia.

Answer 1

No way, the signal output priority is in the video card firmware, usually it is VGA>DVI>HDMI>DP.
Perhaps there are craftsmen capable of fixing the firmware.

Answer 2

In the OS settings, you can select the main monitor