Hello My name is Ian ~ I am not on the site constantly so please be patient whilst waiting for responses to you queries
You have two fans in this appliance on inside that circulates the cool air and depending upon version another close to the compressor. What is likely has happened is that the internal back panel has frozen up and on start up the fan was catching on a piece of ice. Once this was cleared it became quiet again. You need to fully defrost the appliance which will entail switching it off and leaving the door open for 24 hours with towels across the front to soak up the defrosting water. Once you have done this the appliance should work fine ~ Ian
Many thanks for this information. Your advice will be followed and then - fingers crossed for no repeat !! Well worth £20 !!!