whats up with my hotpoint wma58?

Hi there could anyone tell me what's up with my washing machine please? I did a wash and afterwards the lights were flashing in sequence I tried to do a final spin, as I had just done a quick wash and wanted to get rid of any excess water, but it wouldn't spin! I took out the washing and tried again and it spun! Which makes me think the belt is ok but I could be wrong, this machine is around ten years old and I've never had problems with it before. Any ideas what's up? And an estimate on how much to repair please? Many thanks