HD 6770 Flex won't run 3 monitors

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As the title says, I have a Sapphire HD 6770 flex card connected to 3 Samsung monitors all with native 1920x1080 resolutions and 60 hz frame rates. I'm running Windows 7.
Both Windows and AMD Catalyst detect the monitors and both won't let me run 3 at the same time.

The monitors are connected by a HDMI cable, HDMI->DP adapter and a VGA->DVI-I adapter that came with the box.

I've tried a lot of things: reinstalling and updating drivers multiple times, reinstalling Windows completely and I even took the card to my retailers to see if anything's wrong with it.

Can anyone help? Thank you in advance.

EDIT:
Motherboard: Asus M4A785D-V EVO
CPU : AMD Phenom II X4 955, 3.2 GHZ, not overclocked
RAM : 2x2GB
Video Card: Sapphire HD 6770 FLEX
PSU : Antec Earthwatts 430 W, http://www.antec.com/Believe_it/product.php?id=NjQ=
Monitor : Samsung 1xSyncmaster Xl2370HD via VGA->DVI-I adapter, 2xSyncmaster SA350 via HDMI and HDMI->DP,
Hard drives: 2x 1 TB Western Digital green
Optical Drives: DVD-RW
Additional PCI cards: none
Number of fans present: 2

Operating System : Windows 7
Video Card Drivers in Use: AMD Catalyst 11.10
Everything fine.

[Gr33nGecko]

Please read the main troubleshooting STICKY thread, the one with the self explanatory title :

TROUBLESHOOTING - BEFORE POSTING - READ THIS FIRST ( OR THREADS MAY GET DELETED ) !

.. and post up what's asked for in the first post of the thread under the unmissable RED heading "IMPORTANT" .... TIA.

.. monitor model/specs and how you're hooking them up etc ... Might be due to monitor being DVI-D if used on DVI-I or limitation with configuration combination you're trying etc ..