rumorspreader
macrumors newbie
TS, try pointing your DNS to Google's first. It really feels like a DNS issue.
I just rectified a similar case a few months ago. My relative's router was allowing connections but any mobile device that connected to the router can never surf. Only the desktop wired to the router could surf properly. After some troubleshooting, it was a DNS issue. I had them set the DNS manually on their mobile devices and everyone is now happy.
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Actually the DNS solution is for the threadstarter. For your case, your mba is not connecting properly to the router, that's why you are getting the exclamation mark. Re-set it up, and if it doesn't work, then try the dns setting.
Like i said, I have tried many things including going to my system information and deleting the file, forgetting and rejoining the network, doing some things manually, and doing everything manually.