previously i thought something had happened with my modem.
usually i used it in my laptop.
it happened 2 weeks ago when suddenly i couldn't connect to the internet.
i'd tried several times; it didn't work.
i want to take it to be serviced but exams is coming in few days more so i thought better i took it to be serviced after exams had finished.
and just now, i went back from the shop.
it's not my modem having problem.
look like i miss typing something on my laptop.
and tada, in 15 minutes my modem can connect to internet.
what a silly thought.