[Troubleshoot] My desktop PC shuts off after a period of inactivity. Why?

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Hello members,

My computer will randomly shut off when idling.It just turn off. Gaming or any other heavy load is fine. Event viewer shows nothing. I’m thinking it’s the PSU but not sure. Any ideas? Spec below:

i7 4790k Stock Clocks 16GB 1600MHz RAM Asus Maximus Hero VII Motherbord EVGA GTX 1070 FTW Corsair RM1000 PSU 512GB Samsung 950 Pro 2x 500GB Samsung EVO in raid 0 2x 2TB HGST HDD in raid 1 Windows 10 Home Anniversary Update

Only just started happening a week ago.

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It is in the Power Management Advanced Settings tab where Windows still, unfortunately, has hidden all these check boxes in a list format.

The one you want is under:

Sleep > Hibernate After

You can actually type “Never” in there for the plugged in setting.