The Monkees

I've had these things hooked up since last December with no problems whatsoever. Now, all of a sudden my TV can't find any signal from the receiver at all. I tried hooking up my cable box and BD player directly to my TV with no signal still. Eventually it did end up reading my BD player but I cannot get it to read my cable box, I even used the HDMI from the BD player to no avail. It won't read ANYTHING from my receiver at all. I tried switching out HDMI cables and still nothing. I don't get it. Everything work this morning before I went to work. In fact I used my BD player, my cable box and my XBOX (which is also hooked up through the receiver) within the last 18 hours and they all worked just fine.