Hotpoint ultima wma76 drum doesn't go?

My hotpoint wma76 was working fine, although it did sound as though it was going to take off when spinning. Suddenly it was banging around violently and now the drum doesn't spin.
The machine fills up with water, and then sit's there for a few minutes before emptying again and ending programme.
Any suggestions...???
I have had the top off, and the belt is still on, and all connections seem to look fine....