Re: Clicking noise on startup
Can you turn the motor at all by hand? The clicking noise is generally one of two things:
1) Weak battery - check another battery, sometimes they read 12V but can't deliver the current needed.
2) locked motor - no matter how strong the battery, it won't turn over a locked up motor. Try to turn it by hand to rule this out.
Otherwise, i think you are down to replacing the starter, but that is a lower likelyhood (I think).