Macbook running Lion not connecting to internet

Alright this is a problem that just came up recently, for me and the other macbook user in the house (Macbook pro running leopard)
The internet would fail to connect, after inputting the correct password it would display "connection timeout" and act as if the network password was wrong.
I also can't connect to the internet via the ethernet cable either.
The internet is working via ethernet to the main PC in the house and via wireless to my smartphone, but the two macbooks can't connect. There wasn't anything that's changed recently that could have caused the problem, I upgraded to Lion months ago, and have used the internet without difficulty until now.
So far I have deleted and re created the wireless settings on my computer and deleted the keychain information for the network, reset the network encryption and reset the router/modem various times, and so far nothing has worked.
I would be thankful for any help that you could offer.

As an update, I managed to connect via Ethernet. Still no luck with Wi-Fi though.

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WallStreetShari wrote:
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Macbook running Lion not connecting to internet

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