Volumio/Mini86 does not start

Since 2017 I have a “Volumio - Mini 86, 4GB RAM 1TB HDD”. Since a few weeks the Mini 86 can’t be switched on, no sign of life anymore. Is there a trick to check what’s wrong?
If the Mini86 is really out of order, is the “Volumio - Primo” the right alternative? What bothers me about the Primo is the small memory. I want a simple, compact solution and need space for at least 80 - 200GB of music data.

Do you have another psu you can try?
If not, are you able to measure the output of the original psu?