I had a very lightly used Zanussi washer-dryer in storage and today used it to replace my broken-down machine. I removed the transit bolts and connected it all up and started it off. It filled up fine but started making a grinding noise instead of turning. I switched it off and checked I had removed the transit bolts - I had. I emptied it and tried to give the drum a turn with my hand but it won't budge an inch. Any ideas what might have happened? It seems in very good nick, has been stored in a dry garage, I took the lid off and looked inside and there's no obvious rust/corrosion and the belt (if that's the little thing at the top of the machine) seems intact.