6850 wont recognize monitor

[poomwah]

Hello,I have a Gigabyte Radeon 650, I've been running two monitors for a while now, both asus 24 inch, both connected via dvi.
I just got an asus 27 that I would like to run as well, it has a display port, and I have a display port cable hooked to the 6850.
I cannot view both dvi outputs at the same time. I can go into catalyst control center, and choose one or the other, and get either to work, but not at the same time unless I disable the display port monitor. SO, I can get any two to work, but not all three.
what can I do?

 

[poomwah]

thought I should also add that I'm using windows XP. Monitors are set up left to right A B C
A-Asus VH248 DVI cable
B-Asus VE278 Display Port cable (set as primary) I've tried with other monitors set as primary , still only two at a time
C-Asus VH248 DVI cable


When I power up, I get the bios screen on screens A and B
When I get the Windows Welcome screen, its only on B
When windows finishes starting, my display is on B and C

 

[poomwah]

updating the drivers didnt help