|Actually, before doing anything else, you should try recycling the power. Just unplug it, count a slow 10 and plug it back in. Allow a minute or two for it to finish booting and see if your wireless is working.|
If it is, don't do anything else to it and wait and see if it loses it's marbles again. If it does, then update the firmware and even reset it to factory defaults.
If it doesn't work, I'd try the update and reset.