My wifi network isnt connecting&isnt showing up?

ok so everything was connecting perfectly except for my playstation 3 so I decided to unplug my router from the wall and then I plugged it back in and nothing was connecting no computers not my Playstation or anything! I have a Cisco router I checked all the plugs and everything to make sure everything was plugged... show more ok so everything was connecting perfectly except for my playstation 3 so I decided to unplug my router from the wall and then I plugged it back in and nothing was connecting no computers not my Playstation or anything! I have a Cisco router I checked all the plugs and everything to make sure everything was plugged in. Its also a wireless router. please help! this has never happened before. I even press reset on my router!
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