First remove all perishable / frozen items & store if poss in a neighbours or family members fridgefreezer.
Turn the dial to correct setting, normally 3-4 and leave fridge door open for around an hour. Any ice collecting on back of fridge area will disappear. Let fridge go from freezing to normal temperature. Close door and wait. In around another 1-2 hrs frideg should start as it cools to fridge temperature.
If the problem persits, take ALL food from unit & turn off at socket. Leave off for 24hrs. Allow gas & coolants in unit to settle. Plug back in & cross fingers.
If all this fails try a skip...
trev
February 2012