Wifi works but no connection to Internet.

Wifi works but no connection to Internet. 2nd MacBook Pro on same wifi network works (but is using Snow Leopard while I am using lion 10.7.4). iPad works. Everything was working fine until yesterday.

Have restarted router several times. My laptop started working after I did something (under stress, hard to remember, but at least was repairing permissions, maybe more...). Now, the laptop next to mine (my girlfriend's) has the same problem I had. In Network Diagnosis, the first four lights are green, but Internet and Server are red. The router is not mine (we are renting) and not an airport express--it is a Linksys Wireless-G 2.4 GHz: WLAN light and light 1 (in series 1 to 4) are flickering. There is a separate light, Internet, which is not lit. I am writing this from my laptop which IS working from this router...

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