Cant get APM to arm

I am new to quadcopters and am trying to build my first. I have the APM 2.5 and have everything calibrated. I started with high throttle and powered the esc’s. When it beeped I throttled to low and unplugged batt. Then on low throttle I plugged batt. Back in and it played a tune. When I throttled up the motor I have connected ran. It was turning backwards so I changed two motor wires around and tried again. This time it would beep when batt. is plugged in then goes to a beep beep beep with motor twitching each beep. Tried everything I know to do. Please help before I pull out what little hair I have left. Thanks

Gary :smiley:

Not solved. Don’t know how that happened. Posted new post. Thanks