One day while watching t.v the picture went out, but we could still hear what was on it. A few days later we turned it on and we then had no picture or sound coming from it. I've made sure it's turned on and turned the volume up thinking that maybe that was it, but it still doesn't work. So I bought another light bulb, but it still doesn't work. I don't know what else I can do. Can you help me?