Want to help the poor guy out with his 360?

Okay today i switched from DSL to comcast. ive had my 360 hooked up wireless with my router... my wireless wasnt locked, but since the comcast guy was hooking everything up i wanted him to lock my wireless for protective reasons. All of my other things conected just fine with my password for example my laptop, ipod, and so on... so i turned the network settings on my 360 to auto and it wont even pickup the wireless. ive tried disconnecting the laptop and ipod, and reseting the router and all of that good stuff but still cant find my wireless... Help me out plz..

ive tried to the manually thing but it doesnt even pick the ip address.. so i manually put in the ip and all of that.. and i couldnt find the ssid spot... im just not great with the whole wireless ip and ssid stuff... i just dont understand how it found the ip and once the comcast guy came in a switched the provider and locked it how it cant find it when everything else in the house does..