At times it surprises me when some people operates a machine and claim it operates very well when they do not even know of the machine's components. It is pertinent to know of the components of a particular device and their functions so as to be able to identify and troubleshoot in case of the system problem. And so, in this part of the article "Part 4" on 'Computer Appreciation for Beginners', I wish to let you know of the five major components of a computer system.