Have you checked your Power Settings
If not, follow the following steps to do so;
Go to the start menu by clicking on
Type "Power Options"
in the search bar.
Click on the respective icon, and go to "Change plan settings"
next to your selected power plan.
Click on "Change advanced power settings"
, and click on the arrow next to "Desktop background settings"
Click on the arrow next to "Slide show"
and check if both options are set to "Available"
. If not, change them to available.
Click on "Apply"
and you are done.
It should work correctly now.
If that doesn't work, you might want to read this
Good luck and keep us posted!