DisplayPort stuck at 640x480

Hey guys, I havn't been on the forums for awhile, but I figured what better time to start then now. So I have 3 monitors. On the left, a 22 in.; in the middle a 24 in; and on the right, another 22 in. The left monitor is hooked upto DVI, the middle is hooked up via VGA, and the right monitor is hooked up to VGA using a mini displayport to VGA adapter. The right monitor (the one hooked up with Mini Display Port) is stuck at 640x480. I have reinstalled CCC multiple times, driver swepted, re installed older version, and nothing seems to work. Also, at startup it gives me an error saying That my system has detected a displayport failure, however I have tried it on another system and it works fine. So I was wondering what you guys think.

I have a XFX 6870 2GB and currently I am running driver version 13.4 (I've tried the latest version and doesn't work)

Not trying to be a jerk here, but why are you using vga?

Remove the monitor that is plugged into the DP port (unplug it from the card as well). Reboot, do you still get that error?

I'm using VGA because my monitors don't have DVI. They have HDMI, but whenever I use them with HDMI they have odd scaling issues. No I don't get that error when I reboot without the monitor plugged in.

Well, after 5 hours of fiddling with this, I found a solution. For anyone else having this problem, I uninstalled all my drivers and driver sweeped it. Afterwards, I restarted, (with the DP monitor unplugged), installed latest drivers, and restarted with the DP monitor plugged in. And also, never adjust your resolution through CCC.