Sapphire hd5850 no 3rd screen

Hi,

bought a Sapphire HD5850 last week and am yet to enable the 3rd screen.
I've tried the following permutations -

a] DVI(1)+DVI(2)+Displayport through an active DP-to-DVI converter
b] DVI+HDMI+Displayport through an active DP-to-DVI converter

Both options are supposed to work but Catalyst Control Centre only offers me two monitors -
a] the two DVI's
b] the DVI+Displayport through an active DP-to-DVI converter

In both cases CCC has an icon showing what it calls the 'currently disabled display' but I can find no way of enabling it.

Can anyone help?

Cheers,

Derek
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