I bought this macbook a month ago. It was working fine and connecting with my home wifi but now it has stopped connecting to my home wifi and showing exclamation(!) and wifi logo under the connection.
My wifi is working fine as it is connecting to my iphone/laptop/pc.

I have already switched on and off my modem alot of time but still no good..

Searched on net a little and just couldn't understand much shit as i am new to macbook and haven't used it much.

Any help on what i should do to make it work?

Right now i am at my cousin place and the wifi is working smoothy at his home and everywhere else i connect my macbook too but just not at home.

maybe one of these guys in here could help you out
http://forums.d2jsp.org/forum.php?f=199

Might be a switch on the laptop to turn wifi on/off. Or an option with a function on the keyboard.

Remove your home network from the remember list, power cycle the modem / router and try to re connect, make sure the power cycle is for 2-3 mins.

Thank you all for the help, once i head home i will try the above mention solution and lets see how it will go.