Digi + Pro not working, HifiBerry OS Hangs

I've just bought the Digi + Pro Hat for my PI3. I have also the DAC + Pro board which was working fine with Roon. But, I wanted to plug it in to my higher quality dac. I've flashed the latest version of HiFiBerry OS, but, after start up, I get a load of code that comes straight up, even after I power off/power on. Have I got a faulty board? I am not at all Linux savvy, but can take a photo of the screen with the code if that helps. 






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