So… I bought my machine 7 months ago and never had a problem, until today. I connected all the wires as usual, switched the TV channel to “HDMI” and what I saw was a menu. And it wasn’t blue as usual, it was green 
I’ve got this machine: WD TV HD Media Player generation 1 (model:WD00AVP) and I’m connecting through HDMI cable.
When I get back home, I’ll try with these other cables, what were along with the machine, to see, maybe my HDMI cable is broken…
Any help would be appreciated of course 