Linksys Router is connected but no internet access?

My Linksys wrt54g says that it is connected, but no internet access even when the Ethernet? Cable is hooked up to the laptop. It is like this for my ipad, iPhone, and second laptop. Last night it was working fine until I accidently pressed the ses button on the front of the router. Then my internet connection was linksys_ses_xxxx. I did the factory reset and it is back to the unprotected linksys, as it originally was before, but now it says connected with excellent strength but no internet access. I have gotten into the setup page by typing 192.168.1.1 into the Internet address bar and typing my password in as admin. I have also tried powering off the router and nothing has worked. I'm not very tech savy so please keep answers as simply worded as possible!

Step one

Power down the Modem (cable, DSL whatever)
Power down the Router

Power up the Modem
Power up the router

When in doubt turn it off and back on solve 90% of problems with electronics

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