Chevy 6.5L diesel overheated and wont start.?

hey i have a 1996 chevy dually with a 6.5L diesel. my great driver of a mother overheated it and just kept driving it home from out of town. then shut it off, and now it does not start. it cranks but doesnt start. to my relief i checked oil and theres no water in it so i think the head gasket is fine. i dont know much about diesel engines, so if anyone has any guesses to what it may be, please let me know. i appreciate the time and knowledge. thanks.