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Hello everyone, in this lesson we will look at the classification of desktop failures

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Before troubleshooting desktop failures, we first need to have a general classification of desktop failures

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First of all, according to whether the desktop computer is on or not,

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we can divide it into faults that do not start up, and faults after powering on.

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Let's first look at the failure to boot,

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that is, the failure of the screen not to light up.

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When the screen is not on, we should first test whether the uppercase and lowercase lights of the keyboard can be on

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If the keyboard case light can be switched,

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it means that the computer is actually turned on, but it is not displayed

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And if the uppercase and lowercase lights of the keyboard cannot be switched,

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it means that the machine is really not powered on, and we need to further subdivide the failure.

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For example, when we are sure that it is really not a power-on failure,

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we open the case and observe whether the fan turns after pressing the power button

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If you press the power button, the computer does not respond at all,

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the fan does not turn, and the lights do not turn on.

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This is a no-trigger fault

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And when the power button is pressed, the fan has already rotated,

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but the diagnostic card we inserted does not run the code, then this is a failure to run the code

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A more common failure is that after pressing the power button,

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the fan can turn, but it stops after a while.

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We generally call this failure phenomenon as power-on and power-off failure.

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After pressing the power button, the fan can rotate,

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and the diagnostic card we inserted can also run the code, but it stops after running for a while.

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This kind of failure phenomenon we call it block code failure

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This is the general classification of failure to boot

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And there are more fault classifications after starting up

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We can divide it according to whether it can enter the system

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If the computer has entered the system, most of its failures are blue screens of death, or functional failures

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Functional failure means that the sound card network card cannot be used,

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or a hard disk cannot be recognized, etc.

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Functional faults are generally faults with strong directivity

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And when the computer can be turned on, the screen can be lit, but it cannot enter the system

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This kind of failure can be divided into blocking LOGO failure and non-boot failure

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Blocking the LOGO means that after turning on the computer,

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the computer LOGO appears on the screen, and then there is nothing, and the screen freezes

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This is called blocking LOGO failure

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No-boot fault means that after the LOGO, it does not boot the system and cannot enter the system

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This is the no-boot fault

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Of course, the types of faults we list here are only part of the

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There are also some less common faults that are not listed

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We only need to understand these common faults