Welcome to the forums, newcomer!
You might want to state the rest of the specs, i.e, the discrete GPU in your build and the monitors you have to work with. Which revision of the motherboard do you have?
Per the motherboard's spec's page,
here;
(Note 3) You can use only one of the onboard digital graphics ports (HDMI and DVI-D) for output when in BIOS Setup program or when during the POST screens.
You're going to need a discrete GPU. If you have revision 1, 3 or 4 of the motherboard, then you can use two displays off the onboard VGA and HDMI display output ports.