motherboard, which is installed in the chassis. It is one of the most basic and important components of the microcomputer. The performance of the motherboard affects the performance of the entire microcomputer system. The motherboard cannot operate normally, which also affects the normal operation of the computer. This shows that the motherboard is very important. Recently, a friend encountered such a situation: the computer has been used for more than a year, and there have been no major problems during the period. When I started the computer recently, the motherboard could not be started (no display at startup, no alarm sound), what happened?
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From the point of view of the fault phenomenon, there are many reasons for it, which can be ruled out by the exclusion method.
1. Memory problem.
The host can't recognize the memory, the memory is damaged or the memory is not matched: Some old motherboards are more picky about the memory. Once the motherboard is plugged in, the motherboard cannot be activated, and even some motherboards have no fault prompts (tweets). In addition, if you plug in different brands and types of memory, it sometimes causes this failure.
The memory slot is broken or cauterized: sometimes due to excessive force or improper installation method, the reed in the memory slot will be deformed and broken, so that the memory slot is scrapped. When inserting or removing the memory module, apply force vertically to prevent left and right shaking. Before removing or inserting a memory module, be sure to unplug the power of the main unit to prevent the memory from being used when the STR function is used.
2. CPU problems.
The CPU is not powered: You can use a multimeter to test three (or one) long tubes and three (or one) rectifier diodes around it to check if the CPU is damaged.
The CPU socket has a missing pin or loose: This type of fault is manifested by a light that is not lit or an occasional crash. It is necessary to open the top cover of the surface of the CPU socket and carefully observe whether there are deformed pins.
The CPU frequency set in the BIOS is wrong: just clear the BIOS settings to solve. The jumper for clearing the BIOS settings is generally near the lithium battery of the motherboard. The default position is generally 1-2 short circuit. Just change it to 2-3 short circuit, and solve the problem in a few seconds. For the old motherboard, if you can't find the jumper, just remove the battery, wait for the boot to enter the BIOS setup, then turn it off, and install the battery (let CMOS discharge).
3. There is a problem with the motherboard expansion slot or expansion card.
It will cause the motherboard to not respond after plugging in the expansion card such as the graphics card and sound card, thus causing no display after booting.