Don't turn over. Lights come on when key turned, then they go off, no cranking

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The car used to not start without a jump if left idle for 24-48 hours. It would start after that. I took battery out charged it, put it back in. This time when turning the key the lights on dash come on but then they go out when it should be cranking. All lights stay out until I disconnect/reconnect the battery and try to start over. There was a new computer put in vehicle a short time ago but that didn't help the car to start up without a jump. Battery, alternator, starter good.