The screen keep showing the colors red, green and blue

I have a RCA 55” LED LCD Full HD Smart TV. MODEL# SLD55A55RQ. Question is when I plug the TV in and then turn the TV on the television will turn on and I would first see a blank WHITE screen then RED, GREEN, BLUE and a Grayish Color all in the exact same loop, never changing. Not even seeing the RCA starting up symbol. I been dealing with this for months and it just been sitting in the room.. PLEASE HELP.!! It’ been really frustrating me.