Had to get new hard disk for my macbook. After installing snow leopard on new HD the computer only connects to free wifi at certain places and not others. Took it to genius bar (of course it worked find there!) they said it was fine. Not!

Had to get new hard disk for my macbook. After installing snow leopard on new HD the computer only connects to free wifi at certain places and not others. Took it to genius bar (of course it worked find there!) they said it was fine. But problem persist.

Hi there ricalimo,
I would recommend taking a look at the troubleshooting steps in the article below. If the issue is location specific, than you may want to save the article so you can perform troubleshooting when you are experiencing trouble.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
-Griff W. 

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