PLEASE HELP!! The power button on the tv will not shut the tv off. You have to use the remote to

Question

The power button on the tv will not shut the tv off. You have to use the remote to turn it on and off. Once you power the tv on with the remote the tv turns on but a few seconds after being on the picture menu pops up....after a few seconds goes off and continues to do this non stop. Also, the power indicator light continuosly flashes, the remote will not work to move up or down on the picture menu to try and exit or change it nothing seems to work. It just happened last night and it's getting very frustrating! Please help or give some suggestions!! Thank you for any help!