Air port not connecting

I have a linksys wireless internet connector for three macbooks. the first two connect well but when i try to connect to the wifi, an ! symbol appears. the internet worked before on this computer

On the affect Mac reset the Airport connections. First turn off the Airport card then open System Preferences->Network pane . In there delete your Airport icon and don't panic because if you follow the directions it will be back. Then you must reboot your Mac immediately after deleting the Airport card.
Upon the reboot do nothing else but go back in System Preferences->Network pane. In there hit the + button and add the Airport connection again. Don't try to use the Airport card yet!Then you must reboot again!
After this last reboot do the Reset Pram procedure! Then at last you can go into the System Preferences->Network pane and then move the Airport icon to the top of the left hand pane. Then in the Airport card pane turn the Airport card on and configure it for you wireless network.
Hopefully doing this procedure will help reset your Airport card. Please report back if this helps or not, Good Luck.

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