If you can not use your PC with the frequency setting, please try the following method.
1. Reboot the PC and enter safe mode.
2. Select Use VGA mode in safe mode.
3. Click [Start] - [Control Panel] - [Display] - [Change Display Settings] - [Advanced Settings] - [Monitor]
Select screen refresh rate to 60Hz and apply.
If you can not solve the problem, please set the resolution to the minimum and then change the resolution to the monitor.
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