2000 Nissan Frontier wont start

I have a 2000 Nissan Frontier, and when I turn the key, the engine just turns and turns, but will not start. When I
saw this post I checked the plastic nipple. However I did not find one. I called the guy I bought it from, and he
said that they bypassed that safety switch and rand some kind of wire directly as if the safety switch was always
pressed, and tehrefore the truck should crank even without the clutch being pressed. Could this be causeing
the starting problem? How would I reverse it? Is there perhaps some fuse or relay that could have been blown
by this bypass that I could just change? (*note: When I bought the truck, It would crank just fine, even without the
clutch pressed).