I has the same issue i called microsoft and they said check the wires. I did everythung nothing worked. I finally looked inside the wire that connects at the back of the xbox one( power suply cord) two holes of the input there is two pins which r inserted into the xbox one when the plug goes in..Problem was one of the pins were bent. And therefore no power so no power or power light icon. Itook a knife and made the pin straight and it worked