Make sure to be using VISTA, Win7 or Win8. Under WindowsXP, only 2 displays max.
Can you confirm the brand and model of the DP-to-DVI adapters. I understand that you have 3 monitors with DVI inputs, so this is what you should be doing (and it sounds like you are):
- 1 monitor connected directly off DVI port with DVI cable
- 1 monitor connected off a DP port with DP-to-DVI adapter, and DVI cable (can be passive)
- 1 monitor conneced off a DP port with DP-to-DVI adapter, and DVI cable(must be active)
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