Hi everyone, I've been using and appreciating Nuprime for many years.
I currently have a Dac10h paired with the ST10m mono amplifiers.
Yesterday, something really strange happened: the DAC turns on but it doesn't make any sound from any of the inputs.

I tried all the digital inputs and even the line input, but nothing.
To be sure, I tried another DAC in the system; the sources and mono worked perfectly.
I decided to try the DAC in a second system with active speakers, but nothing, total silence.
The DAC turns on, changes input and volume, but produces no output.
Thanks in advance to anyone who can help.