If it wont turn then its not Fuel/Spark related. A no crank (Meaning engine wont spin) will be the battery/starter/or a seized up engine. First thing is disconnect the batter then rotate the crank shaft from the harmonic balancer bolt using a large ratchet. Make certain the engine turns 360 degrees by hand. Likely the battery is simply low on charge, it can have enough current (Amps) to light up lights etc but not nearly enough to turn over the engine especially when its cold/tight. If the engine spins by hand then charge the battery and re-try cranking it over. If the starter still does nothing then it could be a bad starter motor. The brushes wear down and it can get hung in a "dead spot" on the commutator where the power does not flow to the armature and thus the motor does nothing. You will only hear the clicking of the solenoid trying to engage the bendix drive but it will not spin the engine. If thats the case pull the starter and have it bench tested or just replace it.
06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
01 WJ 4x2 4.7v8 Limited (needs valve job)
90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!