Umbrel/Raspi doesn't work anymore

Hey today I got a problem with my raspi 4.
It worked for the last 6 month very well. But today hes unreachable in the network or via hdmi. No Lights flashing, only the red one stays on all the time.

Is it possible that the raspi got destroyed with nothing from outside?

As I said hes not in the network anymore. So I decided to put a monitor on with hdmi but I get no signal.

Maybe you have some ideas.
Im very thankful!