only my wireless signal disapperead

[yosoybr1]

Hi, I'm using Linux Mint 12 with my ASUS 1215b. I was happily using my wireless until this morning. Now, I can see on the wireless connections list all the signals from the neighbors but not mine. And the wired connection does work.
I know the router is working fine, because the second computer in my place has windows and it still can connect to the internet.

Any ideas?

Thanks!