A computer system that allows a user to automatically access one of a plurality of Internet Service Providers which require information specific to the user andor the ISP to be accessed. The power backplane includes multiple mechanical, conductor and isolation layers which serve to route power to and from various components. The main channel has a radially outer margin that opens along at least a portion of the channel’s arcuate extent to an adjoining contaminant collection channel which extends arcuately about the axis and which is effective, as the pumping element rotates, to collect certain fluid-entrained particulates expelled from the main channel and to convey such collected particulates toward the pump outlet.