End of the story
- all 30 capacitors changed.
- PSU changed.
- all connections have been cleaned (with a white eraser)
and... the A2000 WORKS again!!
I've try to work with a used ATX PSU, but it was to huge to fit inside the A2000, so I bought a cute ATX, but this new version hasn't got the -5V wire... tss for a missing component less than 1€, I can't use it... (f**k chinese!
)