I had the same exact issue with my TV which is only 6 mths old, I was so annoyed with it, I actually unplugged everything from the TV ports, my speakers my Apple TV my DVD player even removed the TV cable cord from the wall and the message still came up, so I finally ended up calling the samsung customer service line last night and they also provided me with the same solution "Firmware update" which they sent to me via email, now I just havel to upload that firmware update on USB memory stick and plug it on to TV port and hopefully get that problem fixed but if not, second option will be to call them back to get someone from their designated tech services to look at my TV. the third option will be to get it exchanged as it is still covered under the one year manufacturer's warranty. BEST BUY where I bought it won't exchange it. Overall I have to say that I am very disappointed with this brand purchase, I was so excited to have my very first big flat screen TV so reluctant to buy one since they came out, now I am even more skeptical to try and use the other features within the thing as I do not want to see any more of these unexpected error messages displayed on the screen. Not such as smart TV after all! Guess I should have purchased the extended warranty at BEST Buy when offered. If you are looking to buy one of these TV's that would be my suggestion.
Annoyed Samsung Customer (PC)