How can I fix my Cookworks mixer model HM916?

I bought a Cookworks mixer model HM916 in a sale earlier this year (2010) I didn't try to use it until this month (Nov.) as have a hand blender already. The first time I assembled the mixer and tested it all was fine but when I put ingredients into the bowl to make a cake it wouldn't work. My husband checked the fuse and there's nothing wrong with that, so what can be done to try to repair something that's never even been used?

Victoria McKay
November 2010