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If by turning over you mean that the engine isn't turning when you turn the key, then you have a failure in the starting system. (check battery, connections, relay and starter) If the engine turns but dosen't start, try locking and unlocking the drivers door to re-set the security system.
Do you have an alarm on this? If you do, that is most likely the problem. There seems to be a problem with the alarms. You may want to have a new key made just in case. Sometimes the keys are magnetically charged and after time, it wears off.
Do you know how to check codes on your Jeep? Sometimes the crank position sensor goes out but the Jeep will still run until there is an interruption in power to the ECU. I had a 94 Cherokee do the exact same thing. Turn your key in the following pattern: off-on-off-on-off-on. Leave it on and look at the engine light - it will blink out 2 digit codes. If I remember right code 11 is for the crank sensor...
have you tried manually unlocking the hatch to reset the security
system?? My 94 grand cherokee limited did not have a key pad to turn system on/off...i have reset it by turning the key in the rear hatch lock to the left twice...see if this works. - SmokeWrench
The ignition security on/off is located at the trunk lock. unlock and lock rear gate and the alarm will turn off. My jeep sat in my drive for a month before a jeep tech told me this. It still triggers the security sometimes when I unlock the passenger door with the key and I go straight to the rear gate lock and it shuts off instantly.