Arducopter 2.6 Arming engine sound

Hello!

This is my first forum post here and i hope you guys can help me!

I bought a pre-build quad online from a guy who who was tired of flying/fixing his so I got it cheap, the problem was that since I am a newbe and he had a acro-board mounted on it I had issues flying. I discovered Arducopter and being a software engineer this was awesome! So I bought one fairly cheap online and set of! The problem was that with the old one I have no idea what kind of parts that was on so unfortunately I cannot post the specs...

But here is my issue: Before when I plugged in the battery to the old board, the engine/ESCs made a little tune, then started to beep once every second or so, then I armed the board and another tune came, after that i could fly! But with this board, I get the same sound when i plug the battery in, but when I arm the board, nothing happens. The every second beep continues. Please help! 

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