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Are you connecting through a wireless connection or wired connection? If wireless are you using an encrypted connection?
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If you are using wpa/wpa2 security someone would have had to log into the router to set that up. You log into the router from a computer. What type of wireless router do you have?
If you try to use the wireless again and try to run a connection test on the ps3 what does it do?
Do you still have the blue cable connected to the ps3?