Why my pc wont go in sleep mode when i click sleep mode button in start menu?

[The Eternal Box]

Basically it just turns off my monitor and just keeps workingThe monitor goes back to working when i move my mouse or click any buttonEverything started out fine and worked right but after some time (about a month idk) it stopped workingAlthough automatic sleep mode through option in settings (Go to sleep mode after [time] minutes) still worksWhat could have happen and how can i fix it?

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