Can someone help me fix my RCA tv that keeps flipping off?

My RCA television is turning off almost as soon as it's turned on. No picture, no sound, tried to unplug it and cable box and nothing...The original remote was broken, we use the cable remote, but that will not bring up a menu even if it would stay on long enough to try and find the menu. The menu button on top of the tv, for some reason isn't even working. What else can I do to try and fix this problem?

Karen
May 2012