Other macs are connecting to the wireless no problem.  mine finds the wireless and connects, but I can't browse the internet at all.

I am a teacher.  My Macbook has had no problem all year long connecting to the school's wireless until yesterday.  My computer tells me I am connected, but does not let me use the internet at all.
Things I've tried:
- Restarting
- Running Network Diagnostics (I get to the point where it says my internet appears to be working correctly... but it's not)
- Pinging websites like Google (no success)
- Checking to see that other people's Macbooks are connecting, no problem (they are)
- Checking to see if a browser other than Safari works (Firefox does not)
At home, my computer works fine.  But at school (work), I've got nothing.  Weirder still, in my Mac Mail, I have my Gmail and my school email set up.  The school email (i.e. the local network) is coming through to Mac Mail and working normally, but my Gmail is not working, just like the internet.
Any thoughts about what to try next?

Howdy TrumpetCharlie,
We've an article that can help get your WiFi working normally again.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
Cheers,
Allen

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