Before the blank screen I saw the I tunes logo and a wire like you connect to you computer with a three prong symbol.
AppleTV 2, iOS 7.0.4
Posted on Feb 22, 2014 10:06 AM
Q: Constant blinking light no picture at all what should I do?
AppleTV software or update has a problem, you need to hook it up to a computer running iTunes, see:
http://support.apple.com/kb/ht4367