Macbook won't connect wirelessly on home network

Hey guys,
I see that a lot of you are having the same issue I am. I have a Macbook that I got the summer of 2008. Up until Thursday, it would connect wirelessly to my E-wire router and network just fine. Then it quit. Later that night, I went up to school for a class, and it connected just fine to the wireless network up there, but will not connect wirelessly to my home network. I have since gotten a new router (Netgear) and reconfigured everything (again), including security and all updates. Airport shows that I am connected to my network, and I can load web pages when I am plugged into the router via ethernet cable (as I am now) but when I try to launch Mozilla or Safari wirelessly, I get the "Server cannot be found" error message.
I am connected to my network, I have tried shutting off Airport and restarting it, as well as quitting my browser and reopening it, and rebooting my Macbook all together. And I also went in and manually entered my IP address, which is what allowed me to connect to the network via ethernet cable in the first place.
Any theories why my Macbook (which is newer) won't connect wirelessly whereas my roommates older Macbook doesn't have any issue connecting wirelessly from right next to me? And I know that it's not an issue of too many people trying to be on the network at once, since it's just the two of us at most, and I'm the only one here right now.
Any thoughts or suggestions would be appreciated.

Is your router a model that supports a/b/g/n? If you turn off N will it work? If your N is setup at 40MHz slots it may not work as well. Can you take your wireless router somewhere else for testing? I assume you might have some issue where you are at with your Mac and that router. When you open Apple Menu/About this Mac/More Info../Network/Airport does it show your network there? From a working machine can you see your Mac from your router web interface? FYI if your router was an Apple product(Airport Express or Airport Extreme/Time Capsule) you could see all your wireless clients via the Airport Utility, even signal strength and connection speed...

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    Last edited by kso (2015-01-07 09:10:38)

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