Airport has been working fine since 10.6.2, before that it would often turn off and require a restart, or look like it's on, but I had to turn it off then on for it to work. Since 10.6.2 it's been working fine, and I have left my iMac on for a while. I restarted my iMac today, because the sound wasn't working, and then nothing could connect to Airport. I have tried doing numerous things, but can't fix it.