Abstract: A liquid cooling head includes a bottom plate, a heat dissipation plate, a partition plate and an upper cover plate. The bottom plate includes an opening, and the heat dissipation plate, the partition plate and the upper cover plate are fixed to the bottom plate. The partition plate divides the opening into a plurality of cooling chambers, and each cooling chamber is equipped with a cooling liquid inlet, a cooling liquid outlet, a pump and an electric control device. The cooling liquid inlet and the cooling liquid outlet are formed in the upper cover plate, the pump is fluid-connected to the cooling liquid outlet, and the electric control device drives the pump to rotate, so that the cooling liquid flows through the cooling chamber to cool one heat source below the heat dissipation plate. In addition, a liquid cooling device with the liquid cooling head is also disclosed therein.

Abstract: A booting method for an electronic device having a display device is provided. The method includes steps of receiving a booting signal and, according to the booting signal, a booting procedure is performed. The booting procedure comprises activating a basic input/output system to read a graphic device variable. According to the graphic device variable, a system configuration of the electronic device is set so that the booting procedure is performed with a first graphic device corresponding to the graphic device variable. When the display device displays a booting frame, an operating system is activated. When there is no frame shown on the display device and a hot-key signal is received, the graphic device variable is rewritten according to the hot-key signal so that the graphic device variable corresponds to a second graphic device. A rebooting procedure is performed on the electronic device.