Is my Digi+ dead?

I have Digi-B+ HW 1.1

It worked fine some time ago on raspberry pi 3B. I think it was hifiberryos-20210203-pi3. 

Now I tried with clean install hifiberryos-20210531-pi3 and there is no sound at all. There is no red light in toslink socket. 

I installed raspbian and configured config.txt

aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_digi], device 0: HifiBerry Digi HiFi wm8804-spdif-0 [HifiBerry Digi HiFi wm8804-spdif-0]
Subdevices: 1/1
Subdevice #0: subdevice #0

but when I try

play -n synth sine 1000

it hangs :(

no red light from toslink socket.

How else can I test it to rule out a hardware failure?

I tried it with raspberry pi 4 and latest hifiberryos. The same result.

With raspbian on raspberry 4:

play -n synth sine 1000
play FAIL sox: `default' Device or resource busy: Operation not permitted
play WARN sox: `alsa' output clipped 512 samples; decrease volume?


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