PS3 internet connection help?

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My Playstation 3 was working fine yesterday, and it wouldn't let me sign in today. It works for my ipod, my sister's ipod, and my computer. I go to internet connection test, and it can't obtain the IP address. It did once, but failed to get internet connection. Any help I will appreciate. Thanks!

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Go to Settings> Network Settings> Internet Connection Settings> Wireless> Find your router and type your password> Press x to save and test connection.