Why might a Mercury Sable not start?

Answer

I'd need to know what you mean. You turn the keyswitch and ABSOLUTELY NOTHING happens? It doesn't crank but lights come on? It cranks but doesn't do anything else? It attempts to start but dies immediately?

It sounds like tha starter noise you hear when tha stater is bad put a new starter in and it is still doing the same thing . could the motor be ceased up?