As the most robust and significant part of a computer, motherboard takes a key role in the entire system's working. Owing to improper operation, motherboard failures happen frequently, and its source commonly covers three aspects:  

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Carelessness in manipulation

Some novices and users with little knowledge of computer operation often overlook its specifications and safety, their operation errors easily result in damage in some components. For example, hot plugging or incorrectly installing devices
and interface cards would cause damage or deformation in device interfaces, chips
or cards, and thus leads to malfunction.

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Environment-induced problem

It usually refers to the trouble induced under some unknown, unpredictable or irresistible circumstance. Such as lightning and electricity supply instability, which would directly mangle the system board, generally there is
no way for people to prevent such woes. In another case, the problem could be
triggered by temperature, humidity and dusk, etc. The symptoms include frequent
crashes and restarts, or sometimes can start but sometimes can not turn on the
computer and so on, resulting in instability in the performance of the machine.

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Problem caused by certain poor-quality component(s)

This problem normally brings about malfunction in some motherboard component(s), start failures or POST (Power on Self Test) errors and so on. 

Motherboard problems often include start failure, blank screen and sometimes can start but sometimes can not start, etc. When we troubleshoot these issues we should first observe the
failure, and then listen to the alarm, after that find whether there is a
smell, finally touch in some parts see whether they run hot or get
burned...Here are some common motherboard
repair methods as below:

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Clean your motherboard

Using a brush to get rid of the dust on the motherboard can help resolve problems caused by too much dust or dust with static on the board. Otherwise, you can use an eraser to wipe the oxide layer on its surface, because there are usually
many external boards which golden fingers probably may be oxidized leading to
loose contact with the main board.

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Observation method

In the case of power off, check that is each part correctly attached to its specified seat, are the capacitance and the resistor pins in good contact, does the surface of any part get burned or crack, is the copper foil on any circuit
board burned. Meanwhile, you can touch the surface of some chips and check
whether it is too hot.

Replacement method

When you are not sure the source, you can employ this method and check the suspected parts in turn to figure out the problem. You can unload the suspected part and install it onto a trouble-free computer or the other way round install a good
part to the trouble PC. For instance, if the memory has POST errors or its
capacity is not exact, you can adopt the replacement method to find out the
real culprit.

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Software diagnostics

Here we often refer to the use of the computer's random diagnostic programs or system test software to examine your board. It is applied to check a variety of interface circuit problems.

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