What's the reason why the fan won't rotate when the G mode is turned on in Dell G3?

1, first open the control panel, click on the power options, and then in the power options click on "change plan settings";

2, to bring up the Edit Plan Settings window, click on "Change Advanced Power Settings";

3, pop up the advanced settings of the power options window, drop down the processor power management, and then change the system cooling method to passive.