Screen no longer shuts down on 2017 iMac

[Naiera]

I have the biggest and baddest iMac from this summer and recently the screen has stopped turning off after three minutes. I haven't been able to figure out if a specific program or app was causing it. Restarting fixes the problem only temporarily; at some point the screen will just stay on unless I lock it. When I lock the screen, it'll shut down after a few seconds, as it's supposed to, I guess. It's a decent enough temporary fix, but I'd love it if my beloved Mac and I could just go back to the good ol' days when it did what it was supposed to

Any suggestions will be highly appreciated.

I've uploaded a picture of what my power settings look like. It's in Danish, but the radio buttons are all in the same place anyway

 

[tn-xyz]

have you done a SMC/NVRAM reset?
that's the first thing to do.

 

[Fishrrman]

Set up a "hot corner" for display sleep (screen save preference pane).
Does the display go to sleep now?

 

[Naiera]

I tried the SMC thing earlier, but in hindsight I probably pulled the power cord too early and thus it wasn't actually done. It works right know; we'll see if it holds up.

 

[macs4nw]

I tried the SMC thing earlier, but in hindsight I probably pulled the power cord too early and thus it wasn't actually done. It works right know; we'll see if it holds up.

Any unfinished business in the print queue? That's notorious for messing with screen saver and sleep settings.

 

[Naiera]

I don't have a printer, so there should be nothing in my print queue

 

[Naiera]

Aaaand it's already stopped working again...

I'll try some other things later. Thanks for all the replies.

 

[gian8989]

Sierra or High Sierra?
have you tried to also disable the 1st option?

 

[Naiera]

Fully updated, of course

Turning off the first option seems counter-productive to what I'm trying to achieve. I might as well put it on sleep when I leave it

 

[tn-xyz]

Aaaand it's already stopped working again...

I'll try some other things later. Thanks for all the replies.

did you try a NVRAM reset as well?
otherwise give the onyx app a try and run the maintenance tools.

 

[Naiera]

Resetting the NVRAM is the next thing I'll try, but not until later tonight.

 

[Naiera]

I reset the NVRAM and it works... FOR NOW. We'll see tomorrow