XBOX 360 can't find my Linksys Ciscio

Hello,
i have had an xbox 360 for half a year now which has run on a wireless network to a linksys router. This router broke and so we have just bought the new Linksys Ciscio router to replace it but the only problem is that my xbox 360 console cant even pick it up, i will search for networks and it lists every wireless in the street apart from ours. The new router connect fine to my laptop and computer but not to the xbox. I have taken my xbox to my cousins house to see if its a problem in the xbox but it connected to his wireless fine, and other laptops can connect to our new wireless. I have no idea how to get them to connect so can anybody please help me out in anyway? i would really appreciate it!!
Thanks x