How to use multiple displays with hdmi or displayport

[Cagger]

I have just bought a new Z87 Deluxe motherboard which I am using with a 4770k.

It has integrated hdmi, displayport and mini displayport.
I thought that I would be able to plug in a monitor in the HDMI and the displayport and that I would get independent displays - but I don't. What am I doing wrong or is there something I haven't understood.

Both monitors are working but they only show a duplicate display. I want to extend them. I actually want to extend to third monitor as well.

The second display is not recognised by the system so I am simply getting a duplicate signal. If there is some setting or driver then I can't find it and Windows update can't find it either.

Any clues, anyone?

[curban422]

I run a three LCD setup. Benq 27 inch 120hz as the main and two asus 22 inch 120hz's on the outsides. Right click on the desktop and choose screen resolution. There is a setting for multiple displays. Choose Extend These displays.

[Cagger]

Thanks.
I've tried that but the point is that the additional display isn't isn't recognised. Otherwise it would be easy.
The question is why are there two monitors connected - one through hdmi and the other through displayport that only one monitor is recognised.