LED on in mouse but system inactive.
LED on in mouse but system inactive.
Certain motherboards retain specific USB connections via 5V standby power from the supply unit. This can be handy for activating BIOS Wake-on-key or mouse events. If you prefer, you can adjust BIOS settings to disable power to those ports or redirect your mouse to non-powered areas during shutdown. Many boards also offer a dedicated feature for charging devices like phones while the system is off, often marked with a distinct icon on the IO shield.