Apple TV just keeps blinking, will not start or do anything?
Unplug from power, wait 10-15 seconds and plug back in.
If the device does not power up normally connect to a computer running iTunes and restore.
Mine did the same last night after the latest software update. Unplugging the power did not work for me, so I have to do the restore with iTunes. Now I have to restore all the settings.
Retrieving data ...