PC shuts down

[Windows 11]

It started a few weeks ago, I was playing FC3 and just like that the computer shuts down. The computer is on but does not give response to anything. I think its in sleep mode. Because of this behavior I stoped playing. Now when I have tried with GTAO Enhanced instead, it does the same thing. But now I get a message before the screen goes black but the message is showing too fast to see the message. When the screen goes black and the PC goes silent, the hdd is still working but no matter what key I press, noting happens so I always have to press power button for maybe 1 min before it shuts dow

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