Samsung Smarttv not recognizing HDMI sources? Please help!?

So I recently moved and I am trying to set up my TV. I have my Apple Tv and my cable box (at&t U-verse) plugged in to the HDMI ports of the TV. I've had the TV for a while and it's worked in the past. I have the cords securely plugged in and I've tried switching them into different ports. The TV... show more So I recently moved and I am trying to set up my TV. I have my Apple Tv and my cable box (at&t U-verse) plugged in to the HDMI ports of the TV. I've had the TV for a while and it's worked in the past. I have the cords securely plugged in and I've tried switching them into different ports. The TV won't even register that there's any HDMI cables plugged in- all the options are all grayed out. I've unplugged the TV, the cable box, the Apple tv. I've literally tried everything that I can think of. I'm sooo frustrated because I've tried to Google it but I can't find anyone who had the same problem as me, therefore I can't find a solution. Please, please help
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