Any update on this? I'm having the same issue... purchased chromecast yesterday and never got it passed the update screen, remains on zero. Even after leaving on overnight!
Talked with Google last night at midnight, very cool support is open 24/7, but they were unable to help. the one thing they did mention is that the router should be within 20 feet of chromecast! Mine is easily double that, but everything else in the same location works fine; xbox, roku, LG G2, Nexus 7 and my Vizio DLNA and smart apps. I can stream on everything but the chromecast.
Is the chromecast really that weak?