Generally speaking, if the mouse indicator light is still on after the computer is turned off, it is probably caused by the keyboard and mouse boot function of the motherboard, because the BIOS of the computer motherboard generally provides the setting of the keyboard and mouse boot function, so as long as the BIOS of the motherboard is set, the mouse indicator light will not be on after the computer is turned off. The specific operation method is as follows:

1. First, enter the "Power Management Settings" page of the BIOS main menu. How does the computer enter the BIOS settings?

2. Then find "S3 KB wake-up function" or an option with similar meaning and set it as "Disabled";

3. Turn off the motherboard to supply power to the +5Sb of the keyboard and mouse, and the PS/2 photoelectric mouse will naturally not light up after it is turned off.

4. Change the ACPI of power management in CMOS settings to disabled;

5. Change the string (or S3) to STD (or S 1).