random blank screen when logging in

When I try to log in, sometimes the screen goes blank. I enter my password and nothing.

No mouse, nothing, I can't do anything either, can't ctrl+alt+del, ctrl+alt+backspace, ctrl+alt+f1/f2/f3/.. Then I need to hard poweroff the notebook.

Some times the users dont appear too when trying to turn on, then I need to shutdown.

This is bothering me for some time, but I was too lazy to ask for support. I dont know even if this is the right place.

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