Each year, companies have an average of 501 hours of computer downtime, which cost them millions in annual productivity growth and income and, according to a recent study, computer downtime is responsible for the loss of 3.6% of annual revenues. Which is almost as high income by employee absences (% 6)!
The average lifespan of an office PC is 3-4 years even a computer's life can be cut down to a fraction of that amount if the machine is expected to work in less than ideal conditions.
But most 
of the causes of a computer error can be avoided by keeping some simple steps:
1. User error - Any tool is only as good as the craftsman who uses it, and computers are no different. Actions not shut down properly, skipping scan disks or continuous button pushing while a computer process can damage a computer's hardware, especially drives and processors. Always follow the correct guidance in using a computer machine.
2. Manufacturing Errors-It seems there is an almost infinite number of manufacturers and installers make computers and while some have extensive experience and resources, while others are not more than two guys in a garage, so it is not surprising that an increasing number of computer systems is defective when purchased.
3. Bad Upgrades - It's not just the computers themselves, who are victims of poor craftsmanship, upgrades of inexperienced computer technicians can cause terrible problems. Wrong add-ons as RAM can kill a processor with the same thing, also try to "overclock" or interfere with a processor can often lead to a fatal melt-down.
4. USB device accidentally. It seems everything can be translated into a USB these days. But it maybe that your USB device is not suitable for the operating system you use, or it may be defective, which leads to a fatal short circuit.
5. Power problems - surges or unexpected power cuts can not only cause instant loss of data, but can fry a processor. It is not just power from the grid, causing problems either - lightning can wave through cables (including telephone lines) frazzling your system and then static.
6. Dirt / Dust. A dusty environment will block a computer and block cooling vents causes a computer to overheat. Dust may also contain conductive material and particles may stick to the circuit and cause a short circuit. A cloud of dust can explode if it comes into contact with an ignition source (such as a computer). Even home computers if not properly cleaned can succumb to the problems caused by too much dust.
7. Water / liquids. Of course computers are electric and all electric appliances, computers and water do not mix, just a spilled cup of coffee could see the back of your PC.
8. Heat. Processors may run unusually hot, and if a computer's cooling system is inadequate (because the machine has been upgraded, overclocked or just clogged with dust and dirt), it will only be a matter of time before it packs up for good.
9. Cold. As with heat, not computers do not enjoy the cold too much either. Processors will not work at all if the operating temperature is too cold as condensation inside the machine can freeze and expand damage processor and electronics.
10. Battles / bangs. Computers are sensitive machines, simply moving one PC to another place, can create chaos, disrupt the delicate circles and disks. Dropping a computer or serious blow, and strike will permanently damage circuits and processors or dislodge wires.
The easiest way to protect a PC in business applications from uncontrollable hazards as heat, dust or vibration, is to use an industrial computer cabinet. These industrial PC enclosures allow a conventional PC to be used when housed in a protective cocoon that can be dust, water and even explosive evidence.
