If the key turns in the switch it's OK. If you can turn on the ignition (position 1 so all the warning lamps come on) make sure the the "check engine" lamp comes on. Of it does not, then it is immobilized and you need someone with a Testbook to relearn security. If the check engine lamp is on and the engine cranks but doesn't start, check the usual suspects like the crank angle sensor or the fuel pump.
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