Xbox 360 Slim unable to connect or find a wifi signal.

Pretty much as the title says. I recently bought a slim that was pre-owned and set it up properly. For the first couple of days, I had no problem with connecting to live, but as of about four days ago, my xbox dropped connection. I restarted my router thinking
it was a router issue, but nothing changed. Ethernet and wireless works on all the other devices in my house, and I do not have an extra Ethernet cord for my 360. I thought that maybe with the reset, I would have to disconnect and refresh the connections,
but now my 360 says there are no wifi signals anywhere near by. Any tips on how to fix this?

:)

 

Can't connect xbox 360 slim to a wireless network

I am trying to connect my xbox 360 slim to my wifi network but it doesn't work. My mac is emitting a wifi signal and my xbox can see it but can't connect to my wifi network. What is wrong?

 

wifi usb adapter on xbox slim

I tried to use a regular xbox 360 wifi adapter on my slim to expand my range if you will and it works great and I got full wifi signal strength but it wont let me connect anyway how to get it to work or is it interfering with the built in wifi? Any Ideas
to get this to work would be much appreciated