a newbie putting together apm (with its inline power supply) and f450 kit. Loaded the latest firmware and gone through MP configuration with my spektrum dx5e and calib. accel. During the setup process I didn't hear a sound from ESCs. When the 3S batt is plugged in (throttle at down position) ESCs make two beep then followed by rapid nonstop beeps. apm amber led flashes fast, red and blue leds cycles. Move throttle or trim has no effect.
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problem partially solved by following wiki troubleshooting: used USB to boot the apm before plug in batt. ESCs now make a short musical sound and stop. However, I still cannot get any response from motors by moving sticks. I also tried pull down throttle to right and left to arm and disarm ESCs repeatedly without any result. Please help!