How do I turn off the Screen Saver?
Check out this discussion: Screensaver &quot;start time&quot; option grayed out


The system administrator has probably set the screensaver timeout in a user profile. You can't change it without removing the profile, which will probably cause you to lose network access.

Check if you have a profile (overriding your personal settings) by Apple &gt; System Preferences &gt; Profiles




(&quot;Profiles&quot; is in the bottom right)


if you have a profile, one of these files has its settings: ~/Library/Preferences/ByHost/ look for a file with a long name that begins &quot;com.apple.screensaver&quot;. There may be two such files. Move the one without the word &quot;slideshow&quot; in the name to the Trash.


It most probably applies to your problem too...