Go to the "Advanced" section of the BIOS and then go to "North Bridge Configuration". In that menu, set "IGPU Multi-Monitor" to Enabled.
Your primary display will be the one connected to your GPU (the 1080p monitor, and the one that you will see the BIOS and boot-up with), but the second display (the eMachines monitor and the one connected to your motherboard) should be available once Windows starts.
Edit: You'll need to install the Intel graphics drivers too, when you do that. It should work without doing it, but you should do it anyway.