Two monitors connected, both display, but computer only detects one?

Hofmania

Honorable
Dec 16, 2013
6
0
10,510
Hello! Just finished my recent build.

ASRock Extreme6 Z87 mobo
(2) 22" ViewSonic VX2270 monitors

One is connected via HDMI and one is connected via DVI.

Both monitors work and can display the desktop, however I want them to operate as an extended display.

I've gone into the display settings and only one monitor is detected. I've unplugged one, checked and replugged it back in with the same results.

How can I run two monitors in an extended desktop arrangement? It shouldn't be this hard...