A computer assembly having a processor integrated circuit, a hard disk drive electrically connected to the processor units and a power supply assembly, powering the processor integrated circuit and hard disk drive. These components are sealed in an liquid-tight case defining fluid channels. Electrical connectors permit connection of the processor to outside devices. Finally, a fan in the liquid-tight case, adapted to drive fluid through the fluid channel, thereby facilitates the movement of heat through the computer assembly and creates a monolithic thermal structure. In one embodiment, the computer assembly is powered by a raw DC power supply input and self manages this power input source to provide consistent and reliable power to the computer assembly without burdening the raw DC power supply during transient conditions.