I've had my RetroCastle MiSTer for a couple of weeks now and I've yet to get it to display on my Dell LCD monitor. It does HDMI no problem on my other PC monitor that has HDMI, as well as my TV via HDMI with default ini settings. I have a Ugreen HDMI to DVI cable. I've set dvi_mode=1 and video_mode=4 as my display's native resolution is 1280x1024. Everything else is set to default.
Any suggestions I could try? Thank you to all.