Phenomenons that may occur if there is a problem with the motherboard: 1. No display when booting; 2. CMOS settings cannot be saved; 3. After installing the motherboard driver, a crash occurs or the CD-ROM disk reading speed slows down; 4. The mouse is unavailable; 5. The computer crashes frequently, and it will also crash when making CMOS settings; 6. The motherboard COM port, parallel port, or IDE port fails.

The operating environment of this tutorial: Windows 10 system, Dell G3 computer.

The motherboard is a key component of the entire computer and plays a vital role in the computer. If the motherboard fails, it will affect the work of the entire PC system. Next, let’s take a look at the most common failures of motherboards during use.

Fault 1: No display when starting up

There is no display when the computer is turned on. The first thing we need to check is the BIOS. Important hardware data is stored in the motherboard's BIOS. At the same time, the BIOS is also a relatively fragile part of the motherboard and is easily damaged. Once damaged, the system will be unable to run. Such failures are generally caused by the motherboard BIOS being damaged by the CIH virus. (Of course, it does not rule out that the motherboard itself fails and causes the system to fail to run.). Generally, after the BIOS is damaged by a virus, all data in the hard disk will be lost, so we can determine whether the BIOS is damaged by checking whether the hard disk data is intact. If the hard disk data is intact, there are three reasons that may cause no display at boot:

1. Because there is a problem with the motherboard expansion slot or expansion card, the motherboard does not respond and has no display after plugging in an expansion card such as a sound card.

2. If the CPU frequency set in the CMOS of the jumper-free motherboard is incorrect, it may also cause a non-display fault. This can be solved by clearing the CMOS. The jumper to clear CMOS is usually near the lithium battery of the motherboard. Its default position is generally short circuit 1 and 2. Just change it to short circuit 2 and 3 in a few seconds to solve the problem. For old motherboards, if the user cannot find it Once the jumper is reached, just remove the battery, wait until the power-on display enters the CMOS setting, then shut down the computer, and put the battery up to achieve the purpose of CMOS discharge.

3. The motherboard cannot recognize the memory, the memory is damaged, or the memory does not match, which may also cause no display at boot. Some old motherboards are picky about memory. Once you plug in memory that cannot be recognized by the motherboard, the motherboard cannot start. Some motherboards even do not give you any fault prompts (chirps). Of course, sometimes in order to expand memory to improve system performance, plugging in different brands and types of memory will also cause such failures, so you should pay more attention during maintenance.

For the failure of the motherboard BIOS being damaged, we can plug in the ISA graphics card to see if there is a display (if prompted, just follow the prompts.), if there is no startup screen, you can make one yourself Automatically update the BIOS with a floppy disk and re-flash the BIOS. However, after the BIOS of some motherboards is damaged, the floppy drive does not work at all. At this time, you can try the hot-swap method to solve the problem (I have tried it, as long as the BIOS is the same and at the same level It can be successfully programmed into any motherboard.). However, in addition to requiring the same BIOS, hot-swapping may also cause damage to some components of the motherboard, so a reliable method is to use a code writer to write the BIOS update file into the BIOS (it is safer to find a computer dealer that provides this service).

Fault 2: CMOS settings cannot be saved

This type of fault is generally caused by insufficient voltage of the motherboard battery, which can be replaced. However, some motherboard batteries can be replaced. The problem cannot be solved after the same, and there are two possibilities at this time:

1. The motherboard circuit problem, for which you need to find a professional to repair;

2. The motherboard CMOS jumper problem, sometimes because Incorrectly setting the CMOS jumper on the motherboard to the clear option, or setting it to an external battery, preventing CMOS data from being saved.

Fault 3: After installing the motherboard driver under Windows, a crash occurs or the CD-ROM disk reading speed slows down

This sometimes occurs on some no-name motherboards Phenomenon, after installing the motherboard driver, restarting the computer cannot enter the Windows 98 desktop in normal mode, and the driver cannot be uninstalled under Windows 98. If this happens, it is recommended to find the latest driver and reinstall it. The problem can usually be solved. If it doesn't work, you can only reinstall the system.

Fault 4: The mouse is not available when installing or starting Windows

The software cause of this type of failure is generally caused by CMOS setting errors. There is a modem useIRQ item in the power management bar of the CMOS settings. Its options are 3, 4, 5..., NA. Generally, its default option is 3. Set it to an interrupt item other than 3. Can.

Fault 5: The computer crashes frequently, and it will also crash when setting the CMOS.

If a crash occurs in the CMOS, there is usually a problem with the motherboard or CPU. If the fault cannot be solved by following the method, then the only option is to replace the motherboard or CPU.

Such faults are generally caused by problems with the motherboard Cache or poor heat dissipation in the motherboard design. The author has found this fault on the 815EP motherboard due to insufficient motherboard heat dissipation. After the computer crashed, I touched the motherboard components around the CPU and found that they were very hot to the touch. After replacing the high-power fan, the crash problem was solved. For problems with the Cache, we can enter the CMOS settings and disable the Cache to successfully solve the problem. Of course, the speed will definitely be affected after the Cache is disabled.

Fault 6: The motherboard COM port or parallel port or IDE port fails

Such faults are generally caused by the user plugging or unplugging related hardware while the power is on. At this time, the user can Replace it with a multi-function card, but before replacing it, you must first disable the COM port and parallel port that come with the motherboard (some motherboards even have to disable the IDE port before they can be used normally).

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