HELP!! 4.8is Won't Start. Asking For Code

[dsm2925]

ok.. Folks.. and i would like to thank everyone who commented with suggestions to my thread..

Heres the update!

I took the truck to a nearby shop that i have used before that is very reasonable.
He said it need the CODE but you all may know my navi screen is not working and only displays black.

He put the CODE in with his computer and then the truck started right up.
BUT!!! It can happen again is my understanding and if it does i will need to tow it to him again for him to enter code.

My next mission is to get my navi screen to work. I bought another screen but its the same issue with it too. The guy from the shop advise possibly my radio computer is bad which is located in the trunk next to the computer.. he said usually moister messes them up and it seemed moist when i looked this morning.