First thing is to try to bring up the TV menu so you can see if it produces any kind of picture. If it doesn't then take it back and get an exchange. If you do see a menu then check to see that you are selecting the correct input for that source. I would also check with more than one source i.e. set top box or disc player to see that they both don't work. If you can't get anything at that point it sounds like you new TV is doa. It happens.