Upgrade from pi2 to pi3 with DAC+pro

I was running Openelec with a rPi2 and a DAC+ pro and it worked nice for about 2 years.

Now I bought a rPI3 and i tried to upgrade my music station, but when i switch my rpi3 and DAC+pro on i can hear for at least one minute a loud  annoying sound like an electric shock; then it stops but the output volume is very very low. What's happening? Is the dac+pro compatible with rpi3?


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