Using an ATI firepro 4800 card, with three monitors connected (1 dvi, 2 displayport) on Server 2008 R2 worked fine.

Ive now moved to a new machine, although identical spec, with a fresh Server 2012 install, and cannot get a three display output - only two.

When I try to extend the display on to the third monitor, I get the message "The display settings could not be saved. Please try a different combination of display settings"

The machine is a Dell Precision T1600.

Any help appreciated.