[averysadman]

I bought a DisplayPort adapter for my 5850 today, I have two VGA monitors connected via DVI-D adapters, and I read that I needed a DisplayPort for a third monitor.
I've tried rebooting, tried detecting via both Catalyst Control Center (the ATI software) and the default Windows 7 display options. Theres nothing wrong with the monitor, as it works on other computers.
The monitor I'm trying to get working is a VGA, but the DP is DVI-D, so I also bought a DVI-D>VGA adapter.
So the connection looks like this:
[DisplayPort > DVI-D] - [DVI-D > VGA] - [VGA > Monitor]
Kind of a mess, but I see no reason why it shouldn't work, those are just adapters. It would have been safer to buy a DVI cable, but none of my monitors accept DVI, only VGA.

I'm 100% certain that the monitor is fine, the DisplayPort is compatible with VGA (says so on the box) and my card can take 3 monitors, as it's designed for EYEfinity.

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The problem has been solved, I need an active DP, the one I bought was passive.

[averysadman]

The problem has been solved, I need an active DP, the one I bought was passive.

[phillpower2]

Glad you got it sorted and thanks for posting how it was done so that it may help others