So it looks like many people got the same problem ....
I use Raspbian Pi3 with Jessie X
aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_dacplus], device 0: HiFiBerry DAC+ HiFi pcm512x-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
mplayer -vo alsa Sounds/background.wav
MPlayer2 2.0-728-g2c378c7-4+b1 (C) 2000-2012 MPlayer Team
Cannot open file '/home/pi/.mplayer/input.conf': No such file or directory
Failed to open /home/pi/.mplayer/input.conf.
Cannot open file '/etc/mplayer/input.conf': No such file or directory
Failed to open /etc/mplayer/input.conf.
Playing Sounds/background.wav.
Detected file format: WAV / WAVE (Waveform Audio) (libavformat)
[wav @ 0x75b605b8]max_analyze_duration 5000000 reached
[lavf] stream 0: audio (pcm_s16le), -aid 0
Clip info:
encoder: Lavf57.19.100
Load subtitles in Sounds/
Selected audio codec: Uncompressed PCM [pcm]
AUDIO: 44100 Hz, 2 ch, s16le, 1411.2 kbit/100.00% (ratio: 176400->176400)
AO: [pulse] Init failed: Connection refused
AO: [alsa] 44100Hz 2ch s16le (2 bytes per sample)
[AO_ALSA] Unable to find simple control 'Master',0.
Video: no video
Starting playback...
A: 15.2 (15.1) of 59.1 (59.1) 0.2%
and i hear nothing ;/
I changes the Pi and now ill use a new pi system....