A modularized computer chassis for housing multiple computer modules, such as a processor module, media storage module, an I/O module, and power supplies includes a housing divided generally into four regions, with each region configured for receiving one of the modules or power supplies. A single center pluggable midplane board is positioned in the middle of the housing such that each of the modules and power supplies can be interconnected through the single midplane board. The single center pluggable midplane board includes direct pluggable connectors which correspond to connectors on each of the modules and power supplies, such that each of the modules and power supplies are directly connected to the single pluggable midplane board, and no ribbon signal and power cables are needed for the connection. The direct connection between the single center pluggable midplane board and the modules and power supplies helps to minimize the height of the chassis, thereby saving valuable rack space.