IMac with External Monitor

Hi guys, I have a 20" Aluminum iMac with a 24" external monitor. In OSX I have no problems. I can make the external monitor my primary and I can video mirror the displays. However in Windows Vista I cannot figure out how to make the external monitor my primary. (I get the feeling windows won't let me because it is a mobile video card... the check box for which is the primary display is grayed out) This is not a big deal because I only game in Boot camp. So then I decided I could just mirror the displays. With mirroring my game would show on both monitors. I unckeck "extend my desktop with this monitor" but that just disables the monitor. I can find no option to turn video mirroring on. I searched help and it told me to open the mobile computer control panel? but when i opened it Windows said I can only use it on laptops. I am completely stumped. Anyone have any inside tips? Maybe there is just a command I can give to half life to make it play on the second monitor??? I don't know.
Thanks in Advance,
Jeff

we might be having different issues. I get video on the external, but I am unable to make it the primary monitor. I am also unable to make the two monitors mirror the same content. If you are getting no video at all on your monitor something else is wrong.

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