08 lincoln town car wont start nothing happans when i turn the key

This is assuming you have a fully charged and tested battery. Check for good main power and ground cables and contact points, make sure the security system is deactivated, that procedure is in the owners manual for your model specific procedure, check the ignition and park switches for proper adjustment and operation. If those check good then move onto the starter itself, check for starter activation power when the key is turned to the crank position, if you have activation power and the starter still won’t work then replace the starter.

Answer not posting

Defective ignition key or cylinder. Dead battery. Corroded battery cables. And the list goes on..... I can't see the car from here, so have someone with diagnostic skills, like a mechanic, find the answer.