1994 mercury grand marquis wont start even with a jump start there is nothing from the starter not even a sound.

Let's see if it is the solenoid, the starter, or the wiring. Let's start wit the wiring. Hook a small jumper wire to the big, fat terminal where the battery cable attaches to the starter solenoid. Touch it quickly to a ground and see if there is a spark. Better yet, find an old light bulb like a headlight that works, and use that for your tester. You should have juice to that big teminal on the starter. If it does, next go to the small wire on the starter solenoid that comes from the ignition switch. That wire should have juice only when you turn the key to start, no other time.
Supposing both of those do right, that indicates the problem is in the solenoid or starter.
You must remove the starter and dis-assemble it to see what is wrong, unless you choose to replace it with a new or used one.
The two most common causes of your type problem are burnt contacts inside the solenoid,or used-up carbon brushes inside the starter. Sometimes the armature is toasted inside also.
If the solenoid is only medium burnt, I have used sandpaper to clean contacts sometimes. Starter worn parts must be replaced. A shop should be able to test them for you.