Wireless Problem

So my inability to connect to Xbox Live and my network occurred yesterday. Before that, i've been able to connect everyday with no problem. I really don't know what happend because the network just died out of nowhere yesterday. Everything in the house that was connected to the network, lost the connection as well. So I told my uncle fix since he was the owner of it, and he did.. Every computer in the house was able to access the wireless network perfectly fine after that. But when I tried to connect on the Xbox to it, it wouldn't work. It wouldn't even let me access the network. The password is correct. And the other methods on the support site seemed not needed. Since it was working before, I really don't know what to do. I've tried restarting, plug and unplugging, restoring network to factory settings, i'm out of luck. Anyone have any idea what's happend ?