Kindle has stopped seeing wi-fi connection

[#1]

As stated above.  This morning I can't connect to my router with the kindle.  There has been no problem for the last few months since I had it.
It just says "no wi-fi networks are found."
I don't know if its a kindle fault or my broadband fault. I am connected on my pc with no problem. So I thought I'd ask here first.

[#2]

I would suggest you download a program called inSSIDer which will show you the wireless networks in your vicinity, the strength of signal and lots more
You can get here (its free)  http://download.cnet.com/inSSIDer/3000-18508_4-10848357.html

[#3]

Hi
Log into your router (http://192.168.1.254 if it is supplied by plusnet, and make sure the wireless channel is from 1 to 10
Ian

[#4]

Got on the page but I don't know what to look for. It says under wireless Unknown f0-a2-fc-aa-05  and under that it says Unknown f0-02-25-a2-1d-92
Thanks for your help.

[#5]

Been on to Kindle help and they had me press the button on my router and reset my kindle to factory setting and it worked.  They think that my isp plusnet must have sent an update to the router that caused this to happen. I don't know.
Aft least I can connect now. Thanks.