MacBook not connecting to public wireless network

So I have had this MacBook for 3 years now, and I have always been able to connect to my wireless network at work, which is password free.
But over the past few days, my MacBook has not been able to connect, have tried everything I know( not a computer whiz,but can survive)
I have gone on network diagnostics, and all the icons on the left panel( airport, airport settings, network settings, ISP, Internet, server) are all red instead of green.
I can still connect to my home network.
Please. Need your help.
Ps: my workplace network administrator has not made an new changes to the network.
Thanx

Hi, I had the same problem : airport was not automatically connecting to the previous network.
After browsing a while on the forums I came to think that the solution was to start all over from the begining. So I deleted the information mac os has from my network (ssid + wep key). After inputing it again the issue was gone.
More precisely I gone to system prefs, then to network prefs, then to airport prefs. Then I chose "by default, connect to prefered network". Then I deleted my prefered network. After that I desactivated airport, reactivated it and inputed my settings.
hope that'll help

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