I'm trying to use a M2Tech Young DAC with no success. I use the RC2, but I'm not fluent on linux, so if anyone can help me I'd appreciate it very much. The problem comes when I try to play the music, as it gives the error "Failed to open audio output". The screen of the dac doesn't give the impression to be working. After a little search i tried this:

pi@raspberrypi ~ $ sudo aplay -l
aplay: device_list:252: no soundcards found…

I think this is quite convincing…

Thanks all for your time and your help!