I have a 2009 MacBook Pro that won't connect to the Internet at my university while everyone is able to. How do I fix this?

Try the basics first:

Change your router channel number. Most times this works & is all you have to do.

Disconnect & reconnect your modem. unplug it for about 10 seconds. Plug it back in. Do the same for Apple’s routers. Wait for everything to reboot.

System Preferences>Network

Click the Assist Me button.

In the next window that pops up, click the Diagnostic button & do the necessary.

Research Knowledge Base for network problems that pertain to the OS that is currently installed on your computer. See these basic networking KB Articles: http://support.apple.com/kb/HT1401 AirPort troubleshooting guide

http://support.apple.com/kb/HT4628
Wi-Fi: How to troubleshoot Wi-Fi connectivity

http://support.apple.com/kb/HT2712 Using network locations in Mac OS X

Manually provided DNS server addresses are higher priority than DHCP's

http://support.apple.com/kb/HT1714 Solutions for connecting to the Internet, setting up a small network, and troubleshooting

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What to do when you can't connect to the Internet

Also, run the Airport Utility app which is located inside the Utilities folder.

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If using a Linksys router, contact LinkSys Customer Support and/or post in their forums.

If using Apple's Airport, please re-post over in one of the AirPort Forums.

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Have you read for possible solutions over in the "More Like This" thread over here?----------------------->

School and routers. There may be something that I don't know about your school's configuration, but I'll presume there's no problem for the moment.

The exclamation point error suggests that you're not getting sufficient signal to go on the internet. The most reliable way to fixing this is by recycling the modem. I don't know what your network situation is, but this usually involves logging of the internet, and signing into your network.

Check back in here with your results.

Read these threads, and I'm sure you'll find a solution:

https://discussions.apple.com/thread/2361389?start=0&tstart=0

http://apple.stackexchange.com/questions/49082/how-do-i-troubleshoot-my-wi-fi-co nnection-when-an-exclamation-mark-appears

Ashima Agrawal wrote:

What is a modem? Sorry not very computer literate in that sense. I've turned off my airport and turned it back on again. Is that the same thing as logging off?

Google is your friend. 😉