OBD II not working

My 98 Town Car wont start. worked fine one day and just didn't the next. When I turn the key all the digital dash components come on (odometer, fuel gauge even miles till empty) and the engine turns over with the starter but it just wont fire. Checked out the OBD II reader from autozone and it will not connect to the car. It simply doesn't see anything. I checked all the fuses and all of them were good. what else could be keeping me from connecting via the OBD II?

pcm failure

For "Just For" purposes check your PCM Power relay.

Just in case.

Just a thought.