HELP NEEDED! (URGENT)

hisana — Sun, 03 Jul 2011 12:46:32 +0800

I bought my laptop during mid-May 2011, an Acer Aspire 4750G.

90% of my school compound is equipped with wireless (Different lines such as KMP_Open, KMP_Student, KMP_Staff, HEP, StreamyxZone B1... ...)
Usually we use KMP_Open because password/security code is not required..

Since last Monday (27/06/2011), here comes the problem..
My laptop is connected to the wireless (for example, KMP_Open --> Connected)
but there's "No Internet access"
(KMP_Open --> Connected --> No internet access)
or
(KMP_Open --> Connected --> Unidentified network)

At the beginning I thought it was my school server problem or what..
but I'm wrong.. because all my friends are using this line and they said there's no problem (which means it is my problem..) orz

These few days I'm using my roommate's broadband (Broadband seems to be alright).

Well.. any idea what happen to my laptop??

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HELP NEEDED! (URGENT)