3rd monitor problems

[th3greenroom]

Hello, I've an Asus P8Z68-V Pro Motherboard, 2 Acer 24inch monitors and a Benq 19inch. All monitors work fine from my graphics card, although when I plug any into the motherboard dvi and vga ports none work.
In the display settings when I try to apply the 3rd screen it says"display settings can not be saved"
Any help is greatly appreaciated, cheers

 

[Pyree]

On-board graphics are disable when you have a dedicated gpu.

 

[th3greenroom]

Thanks, I take it that your saying my dvi and vga on my motherboard are disabled because Im using the dvi ports from the graphics cards?
If so, what are my options for a third screen?

 

[Pyree]

Yes, that is what I mean. What GPU do you have?

 

[th3greenroom]

Cheers, My GPU is a Raedon HD 5770.

 

[Pyree]

You can only connect up to 2 DVI, or a DVI and a HDMI. The third one must be connected with display port. IF you need an adapter for the display port so you can plug in HDMI or DVI, you need active adapter.

 

[puntoste]

with nvidias you can connect a second crappy pciexpress videocard to expand your video output, i'm sure it would be possible with atis