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Yup, I am so stupid! Many thanks - also had a great response from buildyourowndrone.co.uk - they are a great site!

Hello, having some trouble with my A2 on the s900. Once I power on with a 4s Lipo I get what sound like warning beeps from all motors with flashes from their LED's (never stops). On my other Heli's this usually means they can't find the flight controller. I've triple checked my A2 connections...