Windows 7 experts - a video card question?

I have two ATI cards – a 4650 and a FireMV2250 – on a Windows 7 system. I need the 4650 (pcie x16) to be my primary card, but whenever I install the 2250 (pcie x1) it becomes primary. I can set the monitor on the 4650 to be my main monitor, but I have to do that each session, which means the projectors attached to the 2250 MUST be on in order to log in to the computer – a real problem. The hardware is set correctly – the switch to the 2250 happens during Windows startup. Can anyone help? (Yes, if you saw my question a couple of weeks ago, I’m still fighting with this silly thing.)