Mini can see network but can't join

So I have a mac mini that I am using headless and controlling via screen sharing from my imac. When I try to log the mini onto my 'n' network, it isn't able to join. I can see my network in the drop-down airport menu in the menu bar, but when I click on the network, the airport bars in the menu bar icon go 'grey' and I am not on the network.
It seems to be able to get onto my 'b/g' network without problems. Neither network has a password (I live out in the woods with no one around) so I don't think it is a security/password issue.
I have no idea how to go about troubleshooting this. Any thoughts?
thanks

If you must connect your Mac Mini to a "pure" 802.11n network, check out solutions provided by QuickerTek as an alternative.

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