Car won't start! Just gone in the garage, unlocked it as normal, got in, gone to start it and nothing. Makes no attempt to start whatsoever, no clicking or anything from starter motor. There is battery power as all the dash lights come on, radio works etc. I looked under the bonnet and this thing was whirring, sounded like a little fan, when you tap it it whirrs faster!? What is this thing, the circular thing with wires going into it? Any ideas what is wrong guys?