No Sound on Samsung Plasma upon start up

My Samsung plasma is 7 years old and just over that last couple of days I have noticed that when you turn the television on there is no sound. Perfect picture but no sound. I have to turn it on and off again and the sound will come on but every time the telly is switched off I have I to turn it on and off many more times. Help, what could it be?

Reply 1 : No Sound on Samsung Plasma upon start up

..will do the trick - should be somewhere in the TV menu