My new macbook pro can't detect wifi sometimes...

hi guys...
i just bought late 2011 macbook pro on 27 april this year...it was succesfully connect to any wifi at anytime & anywhere...
but the problem begins when i stayed at my brothers's house...
my macbook can connect to the wifi there for the 1st time, but after i shut down my MBP and turn it ON again, it cannot detect the wifi at my brother's house, but it's weird when it can detect wifis from neighbourhood...
there' a solution for this problem...i have to repeatedly turn ON & OFF the wifi on MBP many times before it successfully connected...
but unfortunately after shutdown & turn it ON again, i've lost the connection again...what i have to do is repeatedly turn ON/OFF the wifi on MBP AGAIN until it was successfully connected...
pls help me, i already googled this problem but can't find the right solution anywhere...pls help me....thanks in advance....
*additional note:-
- my iphone4 & my ipad2 doesn't have the problem detecting & connecting to the wifi at my brother's house....
- i live in malaysia, my iphone4 & ipad2 is malaysian version but my macbook pro was US version...

Just finished trying the suggestion from my Mac store "genius", and it WORKED. He suggested that I connect to the router directly with ethernet. His thought being that once my MBP found the IP address it would be able to find the network wirelessly. While still connected I went to System Preferences/Network, selected WI-Fi and entered the network info (name & password). There it was - connected.
Don't know how to make this solution available to everyone with the same problem. If someone knows how, go for it.
Thanks to everyone who responded. Your efforts are appreciated.
Jim

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