All those components of computer system that are tangible and on which either input could be given (like keyboard and mouse etc.) or output could be received (like monitor and printer etc.) are known as computer hardware. These hardware components of computer system themselves do not generate instructions but process the instructions generated by either software or user.

Computer hardware is only a subset of word hardware that is when we say computer hardware we only mean the hardware used in computer system but if we say only hardware we mean all the hardware that can be used in any machine. Computer hardware includes following parts in computer system like: keyboard, mouse, floppy drive, hard disk, CD Drive, printer, RAM etc.

But do the hardware alone makes the computer system not it is wrong. A computer system with hardware and without software is life less that means it is same as like a skeleton without life. To make a computer system fully functional software is essential with the hardware. The very basic software that is required for making computer to work in a friendly manner and making it to support all the user activities is operating system.

What is Operating System?
In a layman language operating system is the software that brings life to computer system. It provides an interface between the user and the computer hardware. It directs the user to operate on the computer. It provides guidelines to user on how to work on computer. Operating system is the software that makes other hardware work in an efficient manner.

The field of hardware and software has also become the career for new generation and has very wide prospects in this field. People who wanted them to be established as hardware or software engineers can complete their degree or diploma course from any reputed institution and start their career with the established organization or can if they are willing to be entrepreneurs they can start their own company working in this field.

You may have experienced your computer intermittently re-booting for no apparent reason. This can be annoying, and can mean you have lost valuable work that you we in the process of creating.

If this has happened once, then your chances of explaining the cause are remote in the extreme. If you find it happening regularly, then it is clearly in your interest to find and fix the problem.

With most modern computers, the system comes with built in circuitry to monitor the state of the computer. One of the checks built into your system include testing the power supply levels. The power supply is not a component most people expect to fail. Most are concerned that their disk drives will be the major cause of failures, but in fact power supply problems are relatively common.

The power supply will communicate to the mother board with a power good signal if the power output is within specification. If this power good signal is not present, the computer will simply not start up. Where you have a power supply that is failing, its outputs can fluctuate. The computer may then boot up correctly, but a little later when the power supply falls out of range the computer will detect this and activate the reset logic. The reset logic shuts the machine down, thus relieving the load on the power supply, which can then support a re-boot.  It is the same as if you pushed the reset button yourself, but it appears to you as a random re-boot.

To test the power outputs, you really need access to a multimeter, and know how to use it. This might be something you may prefer to leave to an experienced technician. Alternatively, you can try replacing the power supply with a spare that you know to be working. If this corrects the intermittent re-boot, then you have solved the problem

When replacing a power supply, select a known brand, and I suggest you choose one that is rated to at least 400 watts. This, of course, depends on what load your computer is supporting. Upgrading to a faster processor, installing additional or faster disk drives, or adding other devices can all add to your computer’s power requirements.

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