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If the security light is blinking it will not start. The security system needs to be reset. You will have to have a fully charged battery to reset the system. With a full charged battery turn the ignition forward until the warning lights come on and leave the key in the on position for 15min. Turn key off and wait 10sec. then try and start.You may have to perform this procedure a couple of times, however, it is usually successful the first try. The reduced power light can be set by a low voltage/poor charge battery
You could try re locking the doors then unlock them. Then open the hood and disconnect the negative terminal on the battery for 2 minutes. Hook up the battery and start the truck. This will flush the PCM's cache and restore everything to its normal state.