Volumio 4 and Pi 4 probleme

Hello,

I have a Pi4 running Volumio 3.XXX, with a WaveShare 7.9 and an Innomaker DAC Pro, or USB output to an Amanero and Ethernet connection.

I want to install Volumio 4 to test the new features, but it won’t start.
I flash the SD card with Pi Imager.
I’ve tried different SD cards and two different distributions, but nothing works.

When I start it up, I see the Pi information, then the screen gradually darkens and only colored lines remain.
I tried disconnecting the screen and DAC to run only the Pi, but nothing works.

Am I missing something or am I doing something wrong?

Thank you for your help.
(P.S. I think this is the right place to post this question.)

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