Each month, the typical business or home experiences several electrical disturbances — from infrequent blackouts to spikes, surges, and fluctuations. What most people don't realize is that even the slightest electrical blip poses a danger to all programmable appliances whether the device is a computer or a high priced server and if your computer or server no longer works after sudden power variations it most likely won't be covered by the manufacturer's warranty.
The most common types of power problems and how they can damage your computer:
Blackouts – Total loss of utility power
While most blackouts are relatively brief, storm–related blackouts can last hours or even days.
Blackouts can harm computers in two ways
The sudden loss of power can crash the system and erase data. When power is restored, there may be a momentary surge.
Brownouts – Decrease in voltage level
One of the most common power problems. Brownouts often happen when unusually high demands are made on the power grid. They can also occur when large electrical devices are turned on nearby.
Brownouts can harm computers in several ways
Hardware damage, systems crash, and data loss.
Spikes and Surges – Increase in voltage level
Spikes which are often caused by lightning strikes, are brief but extreme. They can literally fry computer components. Surges are less intense than spikes, but tend to last longer.