I am unable to get the channel to change on my T.V. by the universal remote or by manually changing it with the channel up and down buttons located on the front of the T.V. The T.V. stays on a blue screen with the words "Video 2" being displayed. I am unable to watch my cable T.V. and at this time can ONLY play D.V.D's. Can you tell me what I need to do to correct this problem? Thank you.