2004 wont go into gear front or back. It won't move at all? suggestions???? on 2004 Chevrolet Silverado 1500

It won't move after you put it into gear front or back. do not understand why.

2 answers
poss. relay issue. poss. tranny disconnected. take it to a shop for diagnostic run.
internal trans issues, very common on these trans with approx 100k miles