I will agree with wardak33 and try disconnectiong your battery for a while to reset everything. If it just happened that one time after you let go of the key when it was about to start then maybe the computer needs to be reset. Now I did have to replace the ignition swith in my 04 Ram so I wouldnt put it past that. The ignition switch was pretty easy to do and it didnt cost much (it will cost more if you want to have the same key as door and ignition but i didnt care) I have 175,000+ miles on my Hemi Ram and have had to replace a ton o parts on it