The Apple TV will do this when it doesn't have an Internet connection (but may have a local network connection). Go to Settings -> General -> Network. If you find multiple N/A entries on the screen this indicates that you don't have a working network connection. If you see what appear to be viable entries but still see just the Computers and Settings menus on the home screen, you need to troubleshoot your Internet connection.
Since I updated iTunes to version 10.6 my TV shows on the Apple TV no longer sort properly when I choose to view them by show. Have I done something wrong?
No, it's a bug in iTunes 10.6 and is a problem not only with the most recent Apple TV software, but also with previous versions. It's happening to us too and it makes sorting through a long list of TV shows difficult. We expect Apple to fix it.
My Apple TV is slow about everything and occasionally unresponsive. I'd like to switch it off and on again but there's no power button. Any way to do this short of pulling out the power cord?
With the original Apple TV that's exactly what you'd have to resort to from time to time. Now—except in cases of extreme funkiness—that's no longer necessary. Go to Settings -> General and scroll all the way to the bottom of the screen to highlight the Restart command. Press the remote's Select button and the Apple TV will restart.
If your Apple TV is so confused that you can't navigate its interface with the Apple Remote, point the remote at the Apple TV and press and hold the Menu and Down buttons for about six seconds. With luck, the Apple TV will restart.
If neither of these work, go ahead and pull the power plug.
My Apple TV is clearly unwell and restarting it doesn't help. What should I try now?
We'll start by resetting its settings. Navigate to Settings -> General and scroll down to the Reset command. Press the Select button and in the screen that appears select Reset All Settings and press Select. You'll be asked to confirm your choice. When you do the Apple TV will restart and, hopefully, look as it did when you first unpacked it. You'll need to configure it again with your Apple ID, account names and passwords for any services you use (Netflix and MLB.com, for example), and Home Sharing.
If that doesn't work the expected magic, restore it. You do this in similar fashion. Go to Settings -> General -> Reset but this time select Restore and press the Select button. Again, confirm and wait for the Apple TV to restart. When you restore, a clean version of the Apple TV OS downloads to the device. When it finishes and restarts you'll have to configure it again as you would have when erasing its settings.
But I can't restore it because it's unresponsive to the Apple Remote!