Does your monitor have more than one type of video port? If so you might have to switch it to the right channel.
I think you're referring to an input/source issue? That is not it. If I switch the configuration with the adapters on a different monitor, then that monitor does the same thing. So it's either a adapter issue, configuration issue (as in, something I'm not understanding about Eyefinity + Extended) or a combination of both.
If not are you sure the mini d to dp adapter can handle an analog signal from the vga?
This I do not know. I thought DP could handle both analog and digital. If it is not the case, then what would be the solution? A DP to DVI adapter? And since I will be using it by itself (as opposed to a Eyefinity resolution) do I need an active adapter or can I use a passive?