I am trying to find out what is (normal) at power up. I have purchased a 3DR Hexa kit with 850Kv motors and the 20Amp ESC's. Upon powering up I get an escalating tone then 3 beeps then it sounds like 3 or 4 more beeps but alot faster. I can not get the ESC's/Motors to arm.   What am I missing?   HELP!    See attached video. Thanks in advance! Randall