Why won't my Brandt integrated fridge freezer freeze/cool?

Have a intergrated brandt frost free fridge freezer about 6+ years old freezer has now stopped working after being hit and miss for a couple of months and now the fridge has too. Light still comes on and it does make some noise! Am wondering whether the element or perhaps the motor has gone is there a possible other reason for it failing!What would it cost for a replacement part fitted if it was the element or motor?