Mini Server: Wi-Fi issues with Netgear R6300

I've recently retired my TimeCapsule for the newer Netgear R6300. I've had no problem connecting my old Macbook, iPhone 4, my roommate's HP laptop, and even the PS3 to the Wi-Fi, but my Mini server has not been able to connect. To give some more background info that may or may not effect this, here's what I'm working with:
Netgear CMD31T DOCSIS 3.0 Cable Modem (recommended by Cox ISP)
Netgear R6300 Gigabit Router
Mac Mini OSX Lion Server (purchased from newegg January 2012 and upgraded to Corsair's 2 X 8GB RAM)
I have had no problems with the Mini with the exception of 1 kernel failure that occurred shortly after installing and running "logmein", and no problems since rebooting in safe mode. Connecting between the router and Mini via ethernet has also functioned flawlessly. Why can't I connect this machine to my Wi-Fi?

I see that router does:
IEEE 802.11 b/g/n 2.4 GHz
IEEE 802.11 a/n/ac 5.0 GHz
Can you set it to try a 2.4GHz band ONLY?

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