Televison i "display" mode?

All of a sudden my televison started showing on the screen the message "Here's why this is the television for you" It then automatically starts showing the TV's features - changing the color and closed caption features. Then it goes to sleep mode for 6 seconds, turns off for several seconds and turns back on starting the cycle all over again. I have a 20 in ch Magnovox. It appears to be in "display" mode - I guess you'd call it. What can I do?