Diagnosing is a practice we rely upon in many fields. It takes 'a keen ear". Since his early teens, Dan Oleksiw has built and repaired PCs for his family's small business Computer Heads.  Now, he chairs an IT department at a Connecticut Technical High School. Still helping out on weekends, Dan 'heard" Dave ailing PC's more profound problems and enacted a fix prompting this conversation. Dan's depth of experience told him "something was still not quite right," even after several part replacements. This very computer now works like a charm.