Okay, so I was trying to get the wifi working on a new DSi my sister got for her birthday. Finally after a while we got it working and stuff then suddenly it stopped working so we tried to making it working again but it doesn't find the Airport Express ? It's pluged in and connected to the ethernet thing and everything but doesnt find it when i scan for Apple wireless devices in the Airport Utility.. Help? p.s. a how to get the DS wifi working would be ideal too.