The screen stopped working checking the setting all is fine and pictures are shown in the small window but will not start we time is scheduled was working fine but stopped for no apparent reason
iMac, OS X El Capitan (10.11.3)
- Try starting in Safe Mode and then normal mode
OS X: What is Safe Boot, Safe Mode?
- Next try deleting the system preferences .plist
Please launch the built-in Activity Monitor application and select the Energy tab. Select
View ▹ All Processes
from the menu bar, if it's not already selected. Also select
View ▹ Columns ▹ Preventing Sleep (or Power Assertion)
Click the heading of the Preventing Sleep column to sort the process table. Which processes, if any, show Yes in that column?
screen saver stopped working setting was never changed appear to work then checking the app. will not start when the time is scheduled
