iPod touch won't connect to home wi-fi
Hi! I have an iPod touch, second generation, running iOS 4.2.1. Today I came home from school and discovered that it was no longer connecting to the wi-fi. Now this is odd, because it was working just fine at school. So I went to Settings and typed in my wi-fi passcode, and it rejected it. I kept typing it in (correctly...) and the device kept rejecting it for no apparent reason.
It was working just fine yesterday. My dad's phone and my computer's wi-fi are working just fine, so it's not the router. Could somebody please help me with this?
Oh, and I can't power the iPod off. The shut-off button is broken, so the only way I can shut it down is to drain the battery. And I really don't want to reset network settings and track down all those passwords again. PLEASE HELP ME!
iPod touch, iOS 4.2