It is possible, that the gasses have settled. First try standing the fridge on its head for 24hrs, then back again for a few hours until it has settled, then try turning it on again. It works sometimes but not always. Maybe even turn it over and over again for about 24hrs a time for a good couple of days. It doesn't cost anything to try that route first. Failing that it sounds like you will have to try and find someone who will regass it, but I am still trying after a long time. Health and safety have literally stopped it now and the manufacturers only want to sell a new fridge.
David Wilkinson, August 2006