The motherboard is an Asus PRIME H410M-E. If I turn the PC on and the monitor is not turned on, the motherboad speaker sends a GPU error BEEP code and does nothing else. If I turn the monitor on after the beeps, the screen is black. It doesn't matter is the monitor is set to the PC HDMI input, it only has to be on for the PC to start. Does somebody know of a BIOS setting that I should CHECK? I tried some power settings and DISABLING "wait for F1 if error". I need to use this PC without a monitor sometimes.Does the monitor have any USB ports? If you have a keyboard or mouse plugged into any USB ports on the monitor, the computer is not going to see them if it is turned off, hence the error beeps.In BIOS there should be an option to boot and not halt for lack of keyboard or mouse present. It should be able to be toggled to NONE or Disabled for Keyboard/Mouse present.

Lastly I did have a setup a ways back that had an ECS motherboard that if monitor was off it couldn't detect it and so instead of the video display going out the PCI Express Video Card, it would default to video out on the Integrated VGA port which was a pain. I ended up giving away this motherboard for free as it had a NUMBER of quality and performance issues.