Computer only booting with hdmi

I have a dual monitor setup with 30 series gpu both dpi. A few weeks ago my computer bluescreened (don't remember the error code) and would not boot back on. I can now boot/ turn on my computer fully when i have an hdmi plugged into the mobo. I dont have an issue with this but would like to not have the hdmi requirement to boot. Another issue i have with this is that when changing windows or going from YT to in game my computer will black screen or freeze for 15+ seconds. Yes i can unplug the hdmi once the computer is booted but if i turn it off i must plug it back in to boot it up again. Asus mobo. Any advise on resolving this?