How to prevent a MacBook Pro from connecting to a certain Wireless Network

I just got a new AEBS for christmas, and i have noticed after restarting it to apply new settings, my macbook will automatically connect to the 2.4ghz wireless G signal, instead of the 5ghz wireless N connection. I have tried removing the SSID from the preferred networks list, changing the password in my keychain, and even removing the info from the keychain, also i put the wireless N connection SSID name at the top of the preferred network list, and after trying all of this, my macbook, will still connect to the wireless G connection. Any Suggestions? Thanks Much!

Welcome to the discussions!
Your computer will automatically connect to the strongest signal. 5 GHz signals are absorbed by walls, ceilings and any obstructions far more quickly than 2.4 GHz signals and that may likely be causing the issue that you see there.
Unless your computer is close to the AirPort Extreme (AEBS) and/or you have close to line-of-sight between your computer and the AEBS, the signal from the 2.4 GHz band at your location is probably stronger than the 5 GHz signal.
You do want your computer to choose the best signal possible, correct?
Or, are you asking if there is a way to force your computer to connect to the 5 GHz network, even if the 5 GHz signal quality is not as high?
Please confirm if that is the case. You won't be able to try to force this connection unless you have assigned different network names to your "main" and "guest" networks. By default, they both have the same name. Have you made these changes by clicking Wireless Options in AirPort Utility?

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Hey guys!
I purchased a 15" retina MacBook Pro by July. It brought Mac OS X Lion with it: I had no problems.
However, more than a month later I upgraded to Mountain Lion, and I started to have the same problem ALWAYS: sometimes I would be connected to my home wireless network, perfectly fine. However, after shutting down, sleeping, etc, whenever I would turn the Mac on again, it wouldn't find my home network wireless anymore, but it would find e.v.e.r.y and other network available. Also, my phone, iPad, and every other equipment, would find it and work perfectly. After several restarts and wake ups from sleeps, the Mac would eventually magically find it and stay connected for an unpredictable amount of times (sometimes it could find it continuously for some days after some sleeps, and sometimes it wouldn't be found again after some hours of it being found again (assuming the computer went to sleep)). But if I try any other of the available networks it connects with no issue!
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