I run an Asus 24" monitor and some random samsung 18" 4:3 monitor on the side. I just installed this new card (listed in title) the same way I had my 5770 running and only one monitor will work at a time. I am using the included DVI-VGA adapter. If I plug my Asus monitor in first that one works when I just have the dvi plugged in, then if I add my second monitor using the included adapter it only displays on the second monitor, the Asus one is blank.
I don't know if I explained this correctly.
The top DVI is the one using the adapter plugged into my second monitor
The bottom DVI is just using a plain DVI cable plugged into my main monitor.
This is the exact same way I plugged everything in with my 5770. Please help.
Oh, and this is even before I boot into Windows. It probably isn't a driver issue.