My Apple TV was working fine. I could use it either wired or wirelessly. It was full of my music, photos, and movies. Then the power went out in our neighborhood. Since power came back on, I can't get wireless networking to work. The Apple TV fails to connect to the wireless access point even though I know they see each other. It can't access the Internet, can't be synced to iTunes, and iTunes doesn't show the device. I've tried all of the following: unplugging the Apple TV and waiting 30 seconds unplugging the wireless access point and waiting 30 seconds quitting and relaunching iTunes making sure iTunes is set to look for the Apple TV restarting my Mac resetting and reentering the Apple TV user settings doing a full factory reset on the Apple TV (wiping out all my media on it) resetting the wireless access point to factory settings and redoing all of its settings re-entering the Apple TV network settings (wireless network name and WEP key) half a dozen times, to make sure I entered all-correct information More clues: If I switch to wired networking, the Apple TV works fine, syncing to my Mac and accessing movie trailers from the Internet. While entering the Apple TV wireless network settings, if I enter my wireless network name correctly, it goes to the next step, asking me for the WEP key. If I enter the wireless network name incorrectly, however, it gives me an error message. So it knows the difference, i.e., it can tell when I've entered the correct name. The wireless access point has a log that shows accesses, and it shows acesses from the MAC address of my Apple TV. That's proof that the Apple TV communicates with the wireless access point. But it won't connect to the network after I enter my WEP key, as it had been doing before the power failure. I know I've entered the WEP key correctly (26 hex digits for 128-bit encryption), and I tried changing to a new WEP key and testing that one too. It still refuses to connect wirelessly. I'd read Apple's Apple TV: Tips and Basic Troubleshooting and I have no theories left of what could be wrong. This is driving me nutty. Any ideas?