MBP not connecting to wireless network

[iSaga]

It has been fine until yesterday all of a sudden I started to get one bar of service. Today same thing, I tried resetting the router and rebooting the computer and now I cannot connect to wireless network. I keep getting a timeout error or the message pops up saying I cannnot connect.I'm assuming it is a problem with the computer as I am able use the network from my iPhone.

Any ideas?

 

[atombu]

dude, thats what exactly happened on me
everything works fine in wireless network but MBP........
at the end i reset my router back to factory default setting, and set up the network, password, etc everything once again, now i could login to my network successfully.
hope it help

btw, i also delete the network map(not remember the network) in OSX wireless network preference.