Most extractor hoods are protected by a 3 or 5 amp fuse as Washman has suggested. A bulb blowing will sometimes cause these fuses to blow . You will need to find where the plug/socket is located and check this fuse. If it has gone , please make sure it is replaced by the SAME RATED FUSE. A lot of the time , the appliance plug and socket is situated behind the extractor chimney but as i don’t know your model , i can’t say it is 100{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d}.