My Apple TV is not showing in iTunes. I have restored to factory settings and then updated the software again. Set my wireless network and iTunes name and password, all OK. Still not appearing in the Devices list. I am running OS10.6.4 and the latest iTunes 10.0.1. Any other suggestions?
I have the same problem. I think I have this problem the last couple of months. Apple TV is showing up now and then, and lately it's getting worse. The Apple TV is not showing up, besides some very few moments. In these last months the connection (the syncing) was very, very slow at times.
Indeed if Apple doesn't have a solution for this, the Apple TV can be thrown in the bin, which I would rather not.
I have run into the same problem you all have, with my ATV. Tried all the fixes I can find to no avail. However I think I have found at least one possible answer. It all comes back to the wireless network and the firewall or antivirus software. I have Virus Barrier X6 so finding the problem was relatively simple once I realised where to look. Virus Barrier had quarantined the ATV's IP address after what it perceived as a connection flood attack. I moved the IP address to trusted status and now it all works perfectly, with itunes now busy resyncing my ATV. I don't know if Virus Barrier is particularly sensitive, but it has thrown a few warnings about port scans or connection flood attacks from the various bits of kit I have on my wifi, so there is obviously something about the traffic it doesn't like. As this is something that has only shown up under Leopard and now Snow Leopard, I guess it is something about the newer OSX versions, but don't know what.
I hope this helps to point you all in the right direction.
Mine is working again. I did a reset (although I doubt that it was necessary) of my Apple TV. What puzzled me is that problems started one day and got worse over time, although I hadn't changed anything on my system.
I think my problem had to do with too many neighbors with high power wireless internet. I changed the radio-setting of my Airport Extreme to 5GHz (if I remember correctly) and since then all works fine.