Why has the screen saver stopped working on my Windows 7 PC (Dell Optiplex 780)?

Around two weeks ago the screen saver just stopped being activated. I have always used the screen saver that came with the PC.

I had chosen this theme: Mystify (Wait 10 Mins)

No mouse moving software installed.

Monitor is an old standard no-frills flat-screen monitor.

Computer: Dell Optiplex 780, Windows 7, desktop PC, 32-bit.

Attempted Fixes

I tried the following and nothing helped.

  • Restarted the PC.
  • Changed the Screen Saver theme.
  • Changed the Screen Saver wait time.
  • Changed the Sleep time.
  • Disabled and then enabled screen saver.
  • Did a System Restore.
  • Downloaded lasted update from Norton Anti-Virus and ran a full system scan.

Alternate Options

If there is no way to revive the computer’s screen saver is there a safe downloadable free or cheap screen saver that I can use (without being bombarded with ads in the future)?

Or can I manually cause the computer’s screen saver to activate at will by clicking a desktop icon?