I plugged in the HDMI1 cable into the motherboard when I was repairing my computer and now it seems to think there are two monitors. In my settings, there's a second monitor that, while undetectable, still affects reboots (it automatically goes into VGA first, then HDMI1).
Is this a BIOS issue or can I fix it through Windows 10? There's no option to "delete" the extra monitor, which is apparently #1 priority while my actual monitor is #2. This explains why my computer reboots into VGA first, then HDMI once it detects no actual #1 monitor.