Monitor doesn't show signal on onboard videocard

I have a Asus Sabertooth Z77 motherboard with the latest updated BIOS. This motherboard has an on-board graphics card with a HDMI interface.

I also have a video card itself, I've got an EVGA GTX 680 with also an HDMI interface.

This on-board graphics card works well, when I tu off my main video card (The GTX 680) in my device manager or boot up in safe-mode, I've got the on-board card working.

The interface that is being used is for some reason still coming from the GTX 680.

Now I bought 2 monitors, which are both connected via HDMI, one on my GTX 680 and one on the on-board video card itself.

The problem is that only the monitor which is connected to my GTX 680 is receiving signal. How does this come and how can I fix this?

I've already tried to update my drivers, re-insert and check the cable on the monitor which isn't working and enabled the Multi-Monitor option in my BIOS.

I'm 100% sure the monitor works, because when I connect both the monitors with DVI-D to the GTX 680 (it has more interfaces, but I want it connected via HDMI) both of the monitors work.

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