Xbox 360 can't find my internet everything else in my house can

When I try and connect to xbox live it won't let me, so I view my available networks and my internet (plusnet) is there but has no bars, I thought the internet was down but I had perfect connection on my iPad, about a week ago my xbox connected fine but
now I can't use the internet at all, someone help!! I have the xbox 360 slim

:)

 

Connecting to my Wireless Connection

I've tried everything I can find on this problem and none of it fixes it. The problem is that my Xbox isn't connecting to my wireless Internet connection but, everything else in my house is. I cannot figure out what the problem is. Please help.

 

Additional Authentication Needed

I have the exact same problem. Everything else in my house can connect to the internet flawlessly, only my Xbox needs “additional authentication”

 

If you have no bars then that means you have no signal to that room. Range extenders help if there is a lot of matter between you and the access point. If other devices connect in that room your wireless NIC could have gone out. Have you restarted the
router since this behavior started?

 

Greetings ksherwood!

Before we get stared, I would like you to answer a few questions for us, so that we can better understand your situation.

Please read:
START HERE! And post back in full detail (the questions in bold).

If you haven't already, power off your network equipment (modem/router) for a couple of minutes.

Try restore your Xbox network settings to factory defaults. Browse to Xbox network settings and select
Configure Network. Select the Additional settings tab. Select
Restore network settings to factory defaults and restart your console.

 

Done All the step by step as advised, and then about 45 or 50 mins later everything works like there was never a problem

 

Nothing is working, but my iPad has full connection and my xbox has none, I tried moving my xbox downstairs and it still didn't work, shall I just buy a cable?