To answer this question, you need to understand the effects of dust on computer circuit boards.
Option A) Overheating - This option is correct. When dust accumulates on a computer's main circuit boards, it can act as an insulator and prevent heat dissipation. This can lead to overheating of the components, which can cause performance issues and even damage to the computer.
Option B) Short circuits - While dust can potentially cause short circuits if it accumulates in certain areas, such as between conductive paths, this consequence is less probable compared to overheating. Therefore, Option B is incorrect.
Option C) Slower hard disk - Dust on the main circuit boards is unlikely to directly affect the speed of the hard disk. The speed of a hard disk is mainly determined by its rotational speed and data transfer rate. Therefore, Option C is incorrect.
Option D) None - This option is incorrect because dust can have consequences on a computer's main circuit boards, as explained above.
The correct answer is A) Overheating. This option is correct because dust accumulation on a computer's main circuit boards can block airflow and hinder heat dissipation, leading to overheating.