Abstract: A computer includes a display and a host. The host includes a first hardware, a second hardware, a control chip, a first fan carrying LEDs, and a second fan carrying LEDs. The control chip includes a storing module, a control module, and a setting module. The control module obtains hardware information of the first hardware and the second hardware and stores the hardware information to the storing module. The setting module sets a display mode of the hardware information. The control module indicates at least some of the hardware information on the LEDs of the first and second fans according to the display mode.

Abstract: A battery replacing system for replacing a battery of an electronic device, includes a power storage unit and a switch circuit. The power storage unit can be charged by the battery when the battery is mounted to the electronic device. The switch circuit alternatively connects one of the power storage unit or the battery to an operating system of the electronic device. The switch connects the power storage unit to the operating system to have the power storage unit provide power to the operating system when the battery is detached from the electronic device, and connect the battery to the operating system to have the battery provide power to the operating system when the battery is mounted to the electronic device.