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Help! Asus HD7850 doesn't work with 3 monitors

Hi everyone, I know there are a few similar threads to this already, but I am in a pretty difficult situation, as I have one monitor with just a VGA input, one monitor with HDMI, VGA, and DVI inputs, and one with just DVI and VGA inputs. I have an Asus HD-7850 with 2 DVI ports, one HDMI port, and one mini display port. Currently, I have one monitor connected via DVI, one via HDMI, and one via a DVI to VGA adapter. My computer refuses to recognize the monitor using the DVI to VGA adapter. I have seen some threads where people talk about how you can't use HDMI and DVI at the same time, and that you need an "active adapter", but I have no idea what adapters to use where. Any help?
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    I cant answer about the need for an active adapter, your manual isnt available from asus either...

    Compare your cable and adapter to make sure its dvi-i or dvi-a
    Dvi comes in a few forms: pure digital (dvi-d) analog (dvi-a) or both (dvi-i)
    You analog monitor wont work with a dvi-d cable, adapter or gpu port. The asus have a dvi-d and a dvi-i port I beleive so if your adapter and cable are good then try the other port.

    You can look at pics on the dvi wiki for example of how they connectors look
    http://en.wikipedia.org/wiki/Digital_Visual_Interface
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