1. No display when powered on
There is no display when the microcomputer is turned on. First of all, we are considering BIOS. The motherboard's BIOS stores important hardware data, and is also a relatively delicate part of the motherboard. It is very susceptible to damage. Once damaged, the system will not be run. Such failures are generally caused by the motherboard BIOS being destroyed by the CIH virus (of course, it is not ruled out that the motherboard itself fails to run, causing the system to fail to run.). Generally, after the BIOS is damaged by a virus, all the data in the hard disk will be lost, so we can determine whether the BIOS is damaged by detecting whether the hard disk data is intact. If the hard disk data is intact, there are three other reasons that will cause no display when the computer is turned on:
1. Because there is a problem with the motherboard expansion slot or expansion card, the motherboard does not respond and has no display after inserting an expansion card such as a sound card.
2. For the current jumper-free motherboard, if the CPU frequency set in CMOS is incorrect, it may also cause a failure to display. For this, just clear the CMOS to solve it. Clearing the jumper for CMOS is generally near the lithium battery of the motherboard. The default position is generally 1 or 2 short circuit. Just change it to 2 or 3 short circuit for a few seconds to solve the problem. For old motherboards, if the user cannot find the jumper, just remove the battery and turn it off after the power-on display enters the CMOS settings. The battery is also used to achieve the purpose of CMOS discharge.
3. The motherboard cannot recognize memory, memory corruption or memory mismatch will also lead to failures without display when the computer is turned on. Some old motherboards are more picky about memory. Once they plug in memory that cannot be recognized by the motherboard, the motherboard will not light up, and some motherboards even do not give you any fault prompts (tweets), which makes us take many detours during maintenance. Of course, sometimes in order to expand memory to improve system performance, plugging in memory of different brands and types will also lead to such failures. Therefore, more attention should be paid during maintenance.
For the failure of the motherboard BIOS being damaged, we can plug in the ISA graphics card to see if there is any display (if there is a prompt, you can follow the prompt steps.). If there is no boot screen, you can make a floppy disk that automatically updates the BIOS and refreshes the BIOS. However, after some motherboard BIOS is damaged, the floppy drive does not work at all. At this time, you can try to solve it by hot plugging (I have tried that as long as the BIOS is the same, it can be successfully burned in motherboards of the same level.). However, using hot swapping to remove the same BIOS may also cause damage to some components of the motherboard, so a reliable method is to use a write coder to write the BIOS update file into the BIOS (it can be found to be a computer manufacturer with this service to solve the problem more securely).
For the failure of motherboard damage, some may be caused by the battery leakage after the motherboard is used for a long time, which causes the circuit board to become moldy (for the old motherboard), which makes the motherboard unable to work normally. We can thoroughly clean it to see if it can solve the problem. This method also cures the poor contact of each slot of the motherboard.
Cleaning method: Use tools to remove the BIOS and CMOS batteries on the motherboard, then use a hard bristle brush and washing powder to thoroughly clean each part, and finally rinse it with tap water, and try it after the motherboard is dry (it is safer to store it for a week).
2. The motherboard COM port or parallel port or IDE port is damaged.
Such failures are generally caused by the user's live plug-in and unplugging of related hardware. At this time, users can use a multi-function card instead, but before replacing, they must first prohibit the COM port and parallel port on the motherboard (some motherboards must be prohibited even the IDE port before they can be used normally).
3. CMOS settings cannot be saved
This type of fault is generally caused by insufficient motherboard battery voltage, so it can be replaced, but some motherboard batteries cannot solve the problem after being replaced. There are two possibilities at this time:
1. For the motherboard circuit problem, you need to find a professional to repair it;
2. The problem of motherboard CMOS jumper. Some people set the CMOS jumper on the motherboard as the clear option or set it to an external battery, making the CMOS data unable to be saved.
4. After downloading the motherboard driver in Windows, the crash or the optical drive reading speed will slow down.
This phenomenon sometimes occurs on some non-famous motherboards. After installing the motherboard driver, restarting the computer cannot enter the win98 desktop in normal mode, and the driver cannot be uninstalled under Windows 98, which forces users to reinstall the system.
In some magazines, I have seen some articles about installing motherboard drivers that can improve host speed and enhance system stability. However, as for the current WIN98se version, this version of 98 comes with a relatively new device driver. Unless there is a device conflict under WIN98, there is no need to install motherboard drivers for others (of course, if you purchase a motherboard with a non-INTEL chip, it depends on the installation situation. Some non-INTEL motherboards need to install motherboard drivers).
5. The mouse is not available when installing Windows or starting Windows
The reasons for such failures are generally the following:
1. Cmos setting error. There is a modem use IRQ project in the power management bar set in cmos. Its options are 3, 4, 5..., NA, and its default option is 3. Just set it to an interrupt item other than 3. Such failures are generally common in old 586 computers, and new motherboards today generally do not have this phenomenon.
2. On some old 586 computers, the COM port and LPT port are connected to the outside of the chassis by a signal connection cable. The signal connection cable of the COM port varies depending on the motherboard. If the connection method is incorrect, it will also cause the mouse to be unavailable. Its connection methods are generally as follows: 1. The signal lines are connected to the connector in sequence 1 to 9. 2. The signal line is connected to the connection point, and the upper row of the connection head is connected to the 1, 3, 5, 7, and 9 of the signal line, and the lower row is 2, 4, 6, and 8.
6. The computer frequently crashes, and it will crash even in the CMOS settings.
The crash occurs in CMOS, which is usually caused by the motherboard or CPU. If the fault cannot be solved by pressing the method, then the only way to replace the motherboard or CPU.
Such failures are generally caused by problems with the motherboard CACHE or poor heat dissipation of the motherboard. The author once found that the failure caused by the motherboard's heat dissipation is not good enough on the Elegant 815EP motherboard. After touching the motherboard component around the CPU after the crash, I found that the temperature was very high and hot. After replacing the high-power fan, the crash fault was resolved. For CACHE problems, we can enter the CMOS settings and successfully solve the problem after CACHE is disabled. Of course, the speed will definitely affect it after CACHE is disabled.
7. After the computer is turned on, it stops when it runs as shown in the figure, but the computer does not crash.
Award Soft Ware, Inc
System Configurations
At first glance, you will think that this type of failure is a hardware failure, but after repeated observations and practices, you find that the problem is caused by improper CMOS settings. The options for the PNP OS INSTALLED (plug and play) project in the PNP/PCI CONFIGURATION column set by CMOS are generally "YES" and "NO". The reason for the above failure is that after setting PNP/PCI CONFIGURATION column is changed to "NO", the fault is solved. After some motherboards turn on the plug-and-play function of CMOS, it will also cause phenomena such as abnormal sound card pronunciation, and more attention is needed.
Finally, it is important to note that there are many brands of computer motherboards, and the quality is uneven, and the performance of faults is also strange. Some of the fault analyses listed here are also common fault judgments based on corresponding maintenance experience. Therefore, these empirical analysis is for reference only.
There is no display when the microcomputer is turned on. First of all, we are considering BIOS. The motherboard's BIOS stores important hardware data, and is also a relatively delicate part of the motherboard. It is very susceptible to damage. Once damaged, the system will not be run. Such failures are generally caused by the motherboard BIOS being destroyed by the CIH virus (of course, it is not ruled out that the motherboard itself fails to run, causing the system to fail to run.). Generally, after the BIOS is damaged by a virus, all the data in the hard disk will be lost, so we can determine whether the BIOS is damaged by detecting whether the hard disk data is intact. If the hard disk data is intact, there are three other reasons that will cause no display when the computer is turned on:
1. Because there is a problem with the motherboard expansion slot or expansion card, the motherboard does not respond and has no display after inserting an expansion card such as a sound card.
2. For the current jumper-free motherboard, if the CPU frequency set in CMOS is incorrect, it may also cause a failure to display. For this, just clear the CMOS to solve it. Clearing the jumper for CMOS is generally near the lithium battery of the motherboard. The default position is generally 1 or 2 short circuit. Just change it to 2 or 3 short circuit for a few seconds to solve the problem. For old motherboards, if the user cannot find the jumper, just remove the battery and turn it off after the power-on display enters the CMOS settings. The battery is also used to achieve the purpose of CMOS discharge.
3. The motherboard cannot recognize memory, memory corruption or memory mismatch will also lead to failures without display when the computer is turned on. Some old motherboards are more picky about memory. Once they plug in memory that cannot be recognized by the motherboard, the motherboard will not light up, and some motherboards even do not give you any fault prompts (tweets), which makes us take many detours during maintenance. Of course, sometimes in order to expand memory to improve system performance, plugging in memory of different brands and types will also lead to such failures. Therefore, more attention should be paid during maintenance.
For the failure of the motherboard BIOS being damaged, we can plug in the ISA graphics card to see if there is any display (if there is a prompt, you can follow the prompt steps.). If there is no boot screen, you can make a floppy disk that automatically updates the BIOS and refreshes the BIOS. However, after some motherboard BIOS is damaged, the floppy drive does not work at all. At this time, you can try to solve it by hot plugging (I have tried that as long as the BIOS is the same, it can be successfully burned in motherboards of the same level.). However, using hot swapping to remove the same BIOS may also cause damage to some components of the motherboard, so a reliable method is to use a write coder to write the BIOS update file into the BIOS (it can be found to be a computer manufacturer with this service to solve the problem more securely).
For the failure of motherboard damage, some may be caused by the battery leakage after the motherboard is used for a long time, which causes the circuit board to become moldy (for the old motherboard), which makes the motherboard unable to work normally. We can thoroughly clean it to see if it can solve the problem. This method also cures the poor contact of each slot of the motherboard.
Cleaning method: Use tools to remove the BIOS and CMOS batteries on the motherboard, then use a hard bristle brush and washing powder to thoroughly clean each part, and finally rinse it with tap water, and try it after the motherboard is dry (it is safer to store it for a week).
2. The motherboard COM port or parallel port or IDE port is damaged.
Such failures are generally caused by the user's live plug-in and unplugging of related hardware. At this time, users can use a multi-function card instead, but before replacing, they must first prohibit the COM port and parallel port on the motherboard (some motherboards must be prohibited even the IDE port before they can be used normally).
3. CMOS settings cannot be saved
This type of fault is generally caused by insufficient motherboard battery voltage, so it can be replaced, but some motherboard batteries cannot solve the problem after being replaced. There are two possibilities at this time:
1. For the motherboard circuit problem, you need to find a professional to repair it;
2. The problem of motherboard CMOS jumper. Some people set the CMOS jumper on the motherboard as the clear option or set it to an external battery, making the CMOS data unable to be saved.
4. After downloading the motherboard driver in Windows, the crash or the optical drive reading speed will slow down.
This phenomenon sometimes occurs on some non-famous motherboards. After installing the motherboard driver, restarting the computer cannot enter the win98 desktop in normal mode, and the driver cannot be uninstalled under Windows 98, which forces users to reinstall the system.
In some magazines, I have seen some articles about installing motherboard drivers that can improve host speed and enhance system stability. However, as for the current WIN98se version, this version of 98 comes with a relatively new device driver. Unless there is a device conflict under WIN98, there is no need to install motherboard drivers for others (of course, if you purchase a motherboard with a non-INTEL chip, it depends on the installation situation. Some non-INTEL motherboards need to install motherboard drivers).
5. The mouse is not available when installing Windows or starting Windows
The reasons for such failures are generally the following:
1. Cmos setting error. There is a modem use IRQ project in the power management bar set in cmos. Its options are 3, 4, 5..., NA, and its default option is 3. Just set it to an interrupt item other than 3. Such failures are generally common in old 586 computers, and new motherboards today generally do not have this phenomenon.
2. On some old 586 computers, the COM port and LPT port are connected to the outside of the chassis by a signal connection cable. The signal connection cable of the COM port varies depending on the motherboard. If the connection method is incorrect, it will also cause the mouse to be unavailable. Its connection methods are generally as follows: 1. The signal lines are connected to the connector in sequence 1 to 9. 2. The signal line is connected to the connection point, and the upper row of the connection head is connected to the 1, 3, 5, 7, and 9 of the signal line, and the lower row is 2, 4, 6, and 8.
6. The computer frequently crashes, and it will crash even in the CMOS settings.
The crash occurs in CMOS, which is usually caused by the motherboard or CPU. If the fault cannot be solved by pressing the method, then the only way to replace the motherboard or CPU.
Such failures are generally caused by problems with the motherboard CACHE or poor heat dissipation of the motherboard. The author once found that the failure caused by the motherboard's heat dissipation is not good enough on the Elegant 815EP motherboard. After touching the motherboard component around the CPU after the crash, I found that the temperature was very high and hot. After replacing the high-power fan, the crash fault was resolved. For CACHE problems, we can enter the CMOS settings and successfully solve the problem after CACHE is disabled. Of course, the speed will definitely affect it after CACHE is disabled.
7. After the computer is turned on, it stops when it runs as shown in the figure, but the computer does not crash.
Award Soft Ware, Inc
System Configurations
At first glance, you will think that this type of failure is a hardware failure, but after repeated observations and practices, you find that the problem is caused by improper CMOS settings. The options for the PNP OS INSTALLED (plug and play) project in the PNP/PCI CONFIGURATION column set by CMOS are generally "YES" and "NO". The reason for the above failure is that after setting PNP/PCI CONFIGURATION column is changed to "NO", the fault is solved. After some motherboards turn on the plug-and-play function of CMOS, it will also cause phenomena such as abnormal sound card pronunciation, and more attention is needed.
Finally, it is important to note that there are many brands of computer motherboards, and the quality is uneven, and the performance of faults is also strange. Some of the fault analyses listed here are also common fault judgments based on corresponding maintenance experience. Therefore, these empirical analysis is for reference only.