Brandt Aclass fridge freezer problem?

My Brandt Aclass fridg reezer will not start after noting that the frrzer section is defrosting. Cheched for ice builup but found that it is clear. I have had similar problems after defrosting it in the past when power restored, but it usually comes on after a few mins.This time I can hear it start but turns off after a few seconds. Can you help?

Bob K
May 2012