The mower has been sitting in the shed for at least 6 months. I bought a new battery and tested the charge but the mower will not crank at all. Any thoughts on what it could be? I hear Murray has a lot of these type problems.

Spark plugs. Oil change. Go get it checked out at a home improvement store.

Have you checked your fuse? I am assuming you mean the engine will not turn over at all, is that correct?