DAC+ never boots, HW issue?

I have a HifiBerry DAC+ board which I can't get to boot on a RP 2. Tried with two different  RP 2 boards, 3 different distros (piCorePlayer, Raspbian and Max2Play) and two different power supplies (both 2A).

Act led is only flashing once at power on. Then it is off for a long time and start steady blinking 8 times, indicating SDRAM or power issue I think. 

If I remove the DAC+ board it will boot fine.

I have not check the serial console yet. I assume I can use GPIO14/15 (Tx/Rx) even when the DAC+ is connected.

Anything else I can check on the board like voltage?

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