Deep Sleep. My TV keeps going into deep sleep within seconds of being turned on. It started when

Question

My TV keeps going into deep sleep within seconds of being turned on. It started when I tried to watch a video on my DVD last night. As i was going through the inputs trying to get to the right one it went into deep sleep and shut off. Now when I turn it back on and try to go through the Inputs to get back to TV it shuts off. When I am on TV it doesn't see the signal either. My cable box etc is all turned on correctly