Pc shuts down and does not restart?

I just happened something curious: I was quite normal in TeamSpeak and had Minecraft and a few other launcher open so not really power-consuming.

Suddenly, my PC goes down by itself (with Abmeldescreen) and does not go up since then

He even jumped once, but failed after 1-2 seconds. My theory is that the Peozessor overheated is what I do not understand because the PC was only 12h on and I was also inactive in between 5h. What do you think?

My setup is attached.

Are you coming to the BIOS?

Logically not, since he is not concerned

Definitely!

Then take the plug out and then press the power button for 30 seconds. Then plug the plug back in and try again. Otherwise, briefly remove the battery on the motherboard and insert it again.
If that does not help, the power supply is probably over. Unless he gets power

Check to see if there are still any cables, maybe build out the hard drive (where the operating system is what you use) and build it into another pc. If it's a desktop PC, it does not seem to work on a laptop unless it's Linux.

He seems to get power because I sometimes press the power button but it turns off after 1-2 seconds