[quote]If your displays have only DVI connections, how did you even manage to try any VGA adapters? :?:
This is possible because HP supplies a DVI to VGA cable with its monitors. So VGA to DVI works (tried with a 8800GT & DVI-VGA adapter on my 5970). But no worky with the HP DP-VGA ctive adapter..
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If I follow you correctly then, what you attempted is using a DP->VGA adapter plugged into the video card's DP port; connected the VGA end of the cable to the VGA connection on the adapter; and then connected the DVI end of the cable to the display's DVI connection.
If so, I would never have expected it to work.
I don't see how the signal could be converted "down" to VGA and then back "up" to DVI by a simple cable. Does HP claim that this cable is made to do that?
From several years of personal experience with ATI cards, you would need the special DVI->VGA adapter that comes with ATI's video cards to even get a conversion from DVI to VGA. While I know those work going from DVI to VGA, I'm not sure they would convert the signal in reverse.