Can't connect to network in OSX - Parallels/Windows works fine

Hi All,
My roommate is having kind of an odd issue with his MacBook. He can't connect to any WiFi network while in OSX. He has a full signal, sees the network, but just can't get on. He has Parallels and runs XP on the MacBook as well, and can connect to the network, and surf no problem. He was running Leopard, and we just installed Snow Leopard hoping that may fix the problem - but no dice. Still having the same problem. The router we use at home is an Airport Extreme, but he has the same issue with all networks.
I tried deleting the networks out of his history, and then reconnecting, but it didn't help. Any other ideas? Thanks in advance.
Ben

HI Ben,
No internet is like no tv, it sucky.
Try turning wifi off and on. Try moving closer to the wireless network, preferably the same room as the airport base station.
if no change,
you could try opening safari. sense there is no internet connection, Safari will offer you the chance to run network diagnostics. Fallow the questions, and it cold very likely fix your issue.
If it doesn't, you could try a SMC reset , fallowed by a NVRAM reset:
http://support.apple.com/kb/HT3964?viewlocale=en_US
http://support.apple.com/kb/ht1379
If it still isn't working you could try deleting airport from networking and re-ad it.
open system preferences
click on network
from the left hand column click on airport
click on the minus symbol
click on the plus symbol
for interface chose airport
for service name type airport.
click ok
if you still can't connect try deleting the keychain entry for the wireless network:
go to the dock, click on Finder
go to the menu bar
click on the go menu
chose utilities from the go menu
in the utilities folder double click on keychain
when keychain opens , from the left hand menu click on "system"
in the search field , type in the name of the wireless network.
in the right hand column there should be one entry with the name of the wireless network. delete it.
I hope that helps, good luck!

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