You may now need to go through all your System Preferences to set them up If Night Shift is working how you expect it to then you can empty the Trash. Restart your mac, open System Preferences> Displays> Night ShiftĪnd see if there is a change in behaviour. ~/Library/Preferences/Ī new Finder window will open with the file highlighted. In Finder click on Go in the menubar and select Go To Folder and type in this text. If none of this is happening then it leads me to thinking that the system preferences preference file has become corrupted. When you do this does the temperature of the screen go back to its default.

When you have Schedule set to Off and Manual On then you should be able to see the different colour temperatures as you move the slider but on release the temperature chosen should stick. With Night Shift set to Off you can still operate the temperature slider and see the effect the colour temperature has on the display but on releasing the slider it will default to the native colour temp the display has been set to. I hope that explains what I'm encountering. I've also experimented by setting the Schedule to five minutes ahead of the present time: and can see no visual difference once the time indicated in the Schedule has arrived: my display remains exactly as it was before the scheduled time arrives. I can do the same steps, but at step #4 I adjust the slider all the way to the right – to 'More Warm' – and the result is the same: (i.e., though Night Shift is now 'on' I see no visual difference, hence I cannot conclude that Night Shift is working). There is no appreciable affect on my display whether Night Shift is 'off' or 'on'

Therefore, though Night Shift is now 'on' I see no visual difference, hence I cannot conclude that Night Shift is working.

I see no difference in my display whatsoever – the display remains visually identical as it was at step 3 (when Night Shift was 'off').

I then select 'Manual' – which indicates to me that Night Shift is now 'on' and therefore should affect a visible difference in my display.

I adjust the slider all the way to the left – to 'Less Warm' (and can see, as expected, a difference in the display).

(Steps 1 & 2 indicate to me that Night Shift is 'off').

I'm not sure if I explained my issue clearly, so I'll just outline the steps of what I'm doing, and the affects I'm seeing (or not seeing)

Night shift mac explained