Most PC users suffer from an acute fear of something going wrong with the hardware and not knowing what to do about it. Many of the problems that PCs develop are minor ones that can be fixed by the user. Some faults require the attention of a qualified engineer. Identifying the fault and being able to decide whether to call in the hardware engineer or attempt some troubleshooting yourself will go a long way into making you a complete PC user.
Some elementary troubleshooting techniques are listed here:-