If your screen saver refuses to work no matter how many times you restart your PC, you’re not alone. Many Windows 10 users are reporting this problem as well. No worries, it’s possible to fix.
Here are 3 fixes for you to try. You may not have to try them all; just work your way down and find the one works for you.
- Unplug unnecessary external devices
- Check screen saver settings
- Update Windows and device drivers
- Other options
1: Unplug unnecessary external devices
If you have too many external devices plugged into your PC, there could be interference problem.
Unplugged the external devices you don’t need out of your PC, such as Logitech, Razer, PlayStation, Xbox etc. See if the problem is resolved.
2: Check screen saver settings
Faulty screen saver settings could render it unusable. To fix it:
1) On your keyboard, press the Windows logo key 
and click Control Panel.
2) View by Category, click Appearance and Personalization.
3) Click Change screen saver.
4) In this window, you can choose which screen saver you’d like to use, and then customize it and set the time before it appears. Click Apply and OK to make it work.
3: Update Windows and device drivers
This error can also be caused by a outdated, incorrect or corrupt system driver. You should verify that all your devices have the right driver, and update those that don’t.
1) On your keyboard, press the Windows logo key and I at the same time. Click Update & security.
2) Click Check for updates.
3) You can surely update the device drivers manually by yourself, but if you’re not confident playing around with drivers manually, you can do it automatically with Driver Easy.
Driver Easy will automatically recognize your system and find the correct drivers for it. You don’t need to know exactly what system your computer is running, you don’t need to risk downloading and installing the wrong driver, and you don’t need to worry about making a mistake when installing.
You can update your drivers automatically with either the FREE or the Pro version of Driver Easy. But with the Pro version it takes just 2 clicks (and you get full support and a 30-day money back guarantee):
1) Download and install Driver Easy.
2) Run Driver Easy and click the Scan Now button. Driver Easy will then scan your computer and detect any problem drivers.
3) Click the Update button next to any flagged device to automatically download and install the correct version of this driver (you can do this with the FREE version).
Or click Update All to automatically download and install the correct version of all the drivers that are missing or out of date on your system (this requires the Pro version – you’ll be prompted to upgrade when you click Update All).
Other options
1) If you’re an advanced user, and none of the above methods work, you need to consider updating your BIOS. Please only do so when you’re fully aware of what you’re doing. Any losses is at your own peril.
2) Check to see if you need to get your mouse sensor and mouse pad clean since too much dust on the optical sensor might detect false inputs and prevent your screen saver from showing up.