more 97 jimmy probs. help please

my 97 jimmy is having more issues. i went to start it in the morning and it wouldnt start at all, had power to the lights, all interior lights, and i could hear the fuel pump kicking on as usual, but it wouldnt even make a sound like it wanted to turn over, just as if the battery was dead, after trying for like 5 to 10 mins , it started with no problem, like nothing was wrong with it. i drove it to work, and tried to start it again just to be sure everything was ok, it did the same thing, power to everything but no start, the dealership came and towed it away, tried to start it again before they put it on the tow truck and still nothing. i called this morning and asked them what the staus was, and they said they didnt do anything at all, they started it 14 times, and started every time, they tested the alternator, starter, everything was normal, whats wrong with my jimmy??? im nervous to drive it now because i dont want to get stranded somewhere.
thanks

sound like a fuel pressure problem. if it doesn't start again try cycling the key on and off leave it on till you hear the fuel pump stop do this 4 or 5 times then crank it. or put a pressure guage on it.