The hardware of the computer mainly includes the central processing unit, storage, output device and input device. The keyboard and mouse are typical input devices, and the monitor is the output device.
There are several main parts in the hardware composition of the computer, which are as follows:(recommended learning:PHP Video tutorial)
1. CPU:
Also known as the central processing unit, it is the core component of the entire computer and performs all tasks such as data calculation and transmission. When executing instructions, they need to be guided by the central processor, which is the heart of the entire computer and controls all information processing processes of the computer.
2. Input and output devices:
In computer hardware, input and output devices are an important part. Input devices literally input information and data. Computer equipment, such as keyboards, cameras, mice, and microphones, etc., all belong to the category of input devices;
Output devices are hardware devices that display and output information and data, and printers and monitors are output devices. , mainly a device for displaying display data to people. But in some cases, the entire computer can be used as an output device. When the computer is connected to the network, the entire computer becomes the output device of the network.
3. Storage device:
As the name suggests, the storage device is a hardware device that stores information. It is an important warehouse in the entire computer, storing all The data input and calculated can not only save data and extent, but also extract and output data according to the instructions of the central processor. The storage device that exists inside the computer is called internal memory, and the device that is externally linked is called external memory.
Maintenance Principles
1. Outside-in Principle
Once the external hardware device of the computer fails, it will be extremely serious It's easy to detect and generally easy to fix. However, checking the internal components of the computer requires some special tools, which is more difficult and time-consuming. Therefore, when checking and solving computer hardware security faults, generally follow the outside-in principle.
2. The principle of moving from static to dynamic
To troubleshoot computer hardware system failures, generally first conduct static detection, that is, turn off the power, and check the computer hardware Equipment is inspected. Once there are no problems with the static detection, the power will be turned on and the computer will be functionally debugged and dynamically detected. This static-to-active detection method can effectively avoid damage to other equipment during the maintenance process.
3. The first-first-last principle
Sometimes, there is a problem with our computer. Even if we open the top cover and use testing equipment to detect it, we can’t find it. reason. Finally, I discovered that it was actually a poor contact at the power connector. Therefore, when inspecting computer hardware system security faults, attention should be paid to the order of inspection. The power supply should be inspected first, and then other components should be inspected.
4. Principle from simple to complex
We should pay attention to some small details when testing, such as whether the internal network card of the computer is plugged in place, and whether the internal network card of the host computer is plugged in properly. Whether there is a lot of dust, etc. It's best to check for simple, common faults first, working from simple to complex.
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