My key will not turn in the ignition - how can I start it?

Please provide more information.

"I put the key in the ignition, turn it and the warning light goes out, I turn the key to start but there is nothing..." or

"I put the key in the ignition, turn it and the warning light goes out, I turn the key to start but there only a ticking/clicking sound..." or

"I put the key in the ignition, turn it and the warning light goes out, I turn the key to start but the engine only turns over and doesn't catch."

Put one hand on the steering wheel and rotate slightly left and right alternatively whilst turning the ignition key at the same time with the other hand. This might release the steering wheel and start ignition.

Hope this helps.

First turn of the key energize the car electrical circuits for some circuits radio ets. 2nd turn of the key energize the the starting cycle, when you turn the key to the third spring loaded start mode it completes the circuit to the starter solenoid which engages the starter and start the car, the spring in ignition return the key to ignition on.
Maybe you have a malfunction in the ignition on position. Dont have a large bunch of keys hanging in your ignition, it sings back and forth when the car is in the start mode and cause havoc to your ignition switch.

Neutral Safety Switch ? located at the bottom of the steering column. Mine is tricky, have to pull the shift lever while turning over to get it started. happened after i replaced ignition switch & Neutral Safety Switch

System operation
System arms 5 seconds after switching ignition OFF. Switch ignition ON. Ensure clock LED illuminates for 3-5 seconds. If LED flashes rapidly at regular intervals for approximately 1 minute, then flashes at irregular intervals: Key code not recognised. Remove key and try again.
Programming
When
System malfunction: LED illuminates for 1 minute, then flashes at irregular intervals. Key(s) added or replaced.
NOTE: Replacement keys MUST have blue mark. Keys with red mark are NOT compatible with this system.
How
NOTE: Programming method using vehicle keys can be deactivated using diagnostic equipment.
Obtain 2 programmed keys (A and B). Insert key A into ignition switch. Turn ignition switch to position II. Wait 1 second. Switch ignition OFF. Remove key A. Insert key B into ignition switch within 5 seconds. Turn ignition switch to position II. Wait 1 second. Switch ignition OFF. Remove key B. Within 10 seconds: Insert key to be programmed into ignition switch. Turn ignition switch to position II. Wait 4 seconds. Switch ignition OFF. Wait 5 seconds. Start engine. If engine does not start and clock LED flashes: Switch ignition ON. Wait at least 20 seconds. Switch ignition OFF. Repeat programming procedure. Repeat above procedure to program remaining keys. Keys can also be programmed using diagnostic equipment

you might be able to reprogram the key, but you can only do this if you have two keys, what you need to do is put one key in the ignition turn the ignition on ( not over ) put the key that needs reprogramming into the drivers door and lock the vehicle with the key not the button, wait 10 seconds, remove the key, then press the unlock on the fobb, turn ignition off, remove key from ignition, put in the key that you just unlocked the car with and turn ignition do not turn over, turn off ignition,remove key wait 10 seconds, then put key back in then you should be able to turn it over as normal, if that does not work you will have to take key to be reprogramed at the main dealer...hope this helps

u must put a key to ignition and open a drive door 3 times and press and hold lock button

ENGINE NOT STAY RUNNING.COULD BE STOPPED UP FUEL FILTER BAD FUEL AND .FAULTY OR INCORRECT GAP PLUGS.ALSO BAD SPARK PLUG WIRES.FAULTY IGNITION SYSTEM.USE A DIAGNOSTIC SCANNER TO CHECK IDLE SPEED CODES AND MASS AIR FLOW SENSOR PROBLEMS.

groan.....gunna need a bit more info. but i'll try. What portion of the ignition was ripped out? The tumbler + switch? If so, you might need to get the car's system resent to recognize that it has a new ignition put in. Sime vehicles have a theft prevention system in place to prevent the vehicle from running if its been hot wired. Your best bet would be to replace the damaged ignition components (You did not mention if you did or not). If it still doesn't work after you have replced all of the ignition components. You can try to reset the vehicle (doesn't work on all) disconnect negative battery terminal and go back into vehicle and press down the brake pedal for about 30 seconds then reconnect battery and try it....good luck, hope this helps

is it correct key? key and ignition barrel could be worn wiggle key around in ignition while turning? gently but fast wiggling.try lube in key slot also.
if not replace barrel and key