Cant connect after being on secured network

Hello,
About 2 weeks ago I registered my macbook in the network of my university so that I could get wireless around campus. After succesfully using the system, i went back to my room and tried to connect to my personal router, but it didnt work anymore. It as only after having my computer off for many hours that i could use it again. The computer thinks its connected and can tell the strength of the signal, but when i open safari and go to google, it doent work. Also, today it was working fine, then i putted the computer to sleep, and when coming back, I got the same problem. All this started since registering my computer to the univeristy network.
any suggestions?

Look into the list of Preferred Networks to join under:
Network Preferences -> Show: Airport -> Airport tab then the By default join: list for Preferred networks and rearrange the order or whatever.

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Cant connect after being on secured network

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