A computer includes a motherboard, a heat-generating device mounted on the motherboard, a heat-conducting device attached to the heat-generating device for absorbing heat energy generated from the heat-generating device, and a thermoelectric converter coupled to the heat-dissipating device for converting the heat energy into electric energy for recycling use. The heat-conducting device includes a heatpipe. The heatpipe contains a working fluid, which has nano-sized particles therein. The nano-sized particles may be composed of carbon and/or a metallic material. The computer may include a heat-conducting plate interposed between the heatpipe and the heat-generating device. The thermoelectric converter may include a circuit with two strips connected in series, the strips each being formed of a different kind of thermoelectric metal. Corresponding ends of the two strips would be coupled to the heat-conducting device so as to receive heat energy therefrom.