Any suggestions

Today I get home at lunch turn my truck off and go inside. I came back out after lunch and my truck will not start....... Its not the battery, alternator, or any fuse. My fuel pump is working. Only thing I see different is when I put the key in the run position the odometer normally scrolls across then show s whatever message. Its not doing it now but all the other service lights are coming on including the gear letters. When I attempt to start it acts like it wants to start then it stops.....ahhhhhhh I cant figure out wtf is wrong with it.
 
thanks for any ideas

check the batter terminals,and loose wires you have resestance in a wire somewere or you altenator died and that killed your battery and it doesnt have enough joice to start it.