Apple TV was working, but now won't go past start up
My Apple TV (3rd Gen) was working fine, but I came to use it recently after not using it for about 9 months and it displayed the Restore required screen. I have restored it (twice now) but to start with it just got the the logo then restarted. Eventually it got as far as start-up Language selection & connection to WiFi then restarted. Now although it's stored the WiFi password, it just keeps rebooting after that point.
Help!!
Apple TV