Many times this damage will cause the computer to become unstable. More freezes and error messages. Drivers Drivers are little programs written by the manufacture of a given component like video cards, sound cards, modems and so forth. These drivers are installed in, and become part of, the operating system. Errors in drivers or older versions of these critical components can cause many intermittent problems.
Nobody makes all their own parts.
Not even IBM, Compaq, Dell, or any other computer manufacture makes all the parts in their computer systems. Every computer manufacture buys their video cards from one manufacture, and their modems from another, and their main boards and memory from yet other manufactures. This can, and does, cause problems. A manufacture of say a video card ships thousands of a given model to a major computer manufacture, then the computer company uses these to build thousands of computers. Well after the computers are built and sold to the end user, the video card manufacture discovers a bug in their drivers.