Vero 4k does not boot anymore

Hi after several years without any problems, my Vero 4k does not boot anymore.
I already tried to reinstall and to reflash both with an USB stick and a sd card.
Nothing did work.
Do I have another chance?
The power supply seems so be ok. 5.3 Volt should be good enough.

BTW: LED is blue.

Try on another display as a first step,

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Tht’s it. Great, thank you very much.