samsung side by side fridge freezer?

i have a samsung side by side fridge freezer rs21dcns,
the house power went of (my fault) after 10 mins i got it back on and the fridge freezer would not reset its self,there is power to it the lights inside are working and a small green flashing digit is on, had soneone out to it he said it may have gone sell mode something they do to show in the shops,lust to get lights inside on dont know how to reset it hope someone can help me many thanks john