Full troubleshooting methods for Internet cafe computers (1)

Motherboard

The motherboard is a key component of the entire computer and plays a vital role in the computer. If the motherboard fails, the work of the entire PC system will be affected. Next, let's take a look at the most common faults in the use of the motherboard.

Common Fault 1: No display at startup

No display is displayed when the computer is started. The first thing we need to check is the BIOS. The BIOS of the motherboard stores important hardware data, and the BIOS is also a vulnerable part of the motherboard, which is vulnerable to damage. Once damaged, the system may fail to run, this type of fault occurs generally because the motherboard BIOS is damaged by the CIH virus, and of course the failure of the motherboard itself is not ruled out, resulting in the system failure .). After the BIOS is damaged by viruses, all data in the hard disk will be lost. Therefore, we can check whether the hard disk data is intact to determine whether the BIOS is damaged. If the hard disk data is intact, there are three reasons for the problem of no display at startup:

1. due to problems with the motherboard expansion slot or expansion card, the motherboard does not respond and is not displayed after an expansion card such as a sound card is inserted.

2. If the CPU frequency set in CMOS is incorrect on the patch cord-free motherboard, no fault is displayed. In this case, you only need to clear CMOS to solve the problem. The patch cord for removing CMOS is generally located near the lithium battery of the motherboard. Its default position is generally 1 or 2 short circuits. You only need to change it to 2 or 3 short circuits for several seconds to solve the problem, if the user cannot find the patch cord for the old motherboard, just remove the battery, wait for the display to enter the CMOS settings after the boot, and then shut down the battery to discharge the CMOS.

3. Failure to identify memory, memory damage, or memory Mismatch on the motherboard may cause no fault displayed during startup. Some old mainboards are very picky about memory. Once the memory cannot be recognized by the motherboard is inserted, the motherboard cannot be started, or even some mainboards won't prompt you for any fault ). Of course, sometimes, in order to expand the memory to improve the system performance, inserting different brands and types of memory will also lead to such faults. Therefore, pay more attention to the troubleshooting.

If the motherboard BIOS is damaged, you can insert the ISA video card to check whether the display is displayed. If any, follow the prompts to perform the operation .), If you do not have a boot screen, you can make a floppy disk that automatically updates the BIOS and refresh the BIOS. However, some motherboard BIOS will not work after it is damaged, I have tried to solve the problem by using hot swapping. If the BIOS is the same, the system can be installed on the motherboard at the same level .). However, using hot swapping in addition to the need for the same BIOS may also cause damage to some components on the motherboard, therefore, the reliable method is to use the writer to write the BIOS update file into the BIOS. You can find a computer provider with this service to solve the problem ).

Common Fault 2: The CMOS settings cannot be saved.

This type of fault is generally caused by insufficient battery on the motherboard. you can replace it with this type of fault. However, some battery on the motherboard cannot solve the problem after the battery is changed. There are two possible causes:

1. Ask a professional for repair of the motherboard circuit;

2. Due to the problem of the motherboard CMOS jumper, sometimes the CMOS jumper on the motherboard is set as the clear option or an external battery, so that the CMOS data cannot be saved.

Common Fault 3: After the motherboard driver is installed in Windows, the reading speed of the drive or optical drive is slow.

This problem sometimes occurs on some miscellaneous boards. After the motherboard driver is installed, you cannot restart the computer to enter the Windows 98 desktop in normal mode, the driver cannot be uninstalled under Windows 98. In this case, we recommend that you find the latest driver and reinstall it. The problem can generally be solved. If not, you can only reinstall the system.

Common Fault 4: The mouse is unavailable when Windows is installed or Windows is started

Software causes of such faults are generally caused by incorrect CMOS settings. There is a modem use IRQ item in the Power Management bar of the CMOS settings. The options are 3, 4, 5 ......, NA. Generally, its default option is 3. Set it to an interrupt item other than 3.

Common Fault 5: frequent computer crashes and the CMOS settings may also cause crashes.

A crash occurs in CMOS, which is generally caused by a problem with the motherboard or CPU. If the fault cannot be solved by pressing the following method, you only need to replace the motherboard or CPU.

This kind of fault is generally caused by a problem with the motherboard Cache or poor design and cooling of the motherboard. On the 815EP motherboard, I found that the fault was caused by the poor heat dissipation of the motherboard. After the host crashes, the main board components around the CPU are touched and the temperature is very hot. After replacing the high-power fan, the dead end fault can be solved. If there is a Cache fault, we can go to the CMOS settings and disable the Cache to Solve the Problem smoothly. Of course, the speed after the Cache is disabled will certainly be affected.

Common Fault 6: failure of the main board's comport, parallel port, and IDE Port

This kind of fault is generally caused by the live insertion and removal of hardware by the user. At this time, the user can use a multi-function card instead, however, before replacement, you must first disable the use of the comport on the motherboard and the integrated IDE port on the parallel port ).

Graphics card

Common Fault 1: No display at startup

This type of fault is generally caused by poor contact between the video card and the motherboard or problems with the motherboard slot. For some motherboard With integrated graphics card, if the video memory shares the main memory, you need to pay attention to the location of the memory stick. Generally, there should be a memory stick in the first memory stick slot. No fault is displayed when a video card is turned on. After the video card is turned on, a long and short beep sound is usually sent to the award bios video card ).

Common Fault 2: display screen, not clear handwriting

This type of failure is generally caused by the failure of High Resolution on the display or video card. You can switch the startup mode to safe mode during screen display. Then, go to display settings under Windows 98, and click "application" and "OK" in the 16-color status. Restart. In normal Windows 98 mode, delete the graphics card driver and restart the computer. Or do not enter the safe mode. In a pure DOS environment, edit SYSTEM. INI file, set display. change drv = pnpdrver to display. drv = vga. after drv, save the disk and update it in Windows.
Driver.

Common Fault 3: The color display is abnormal, which is generally caused by the following reasons:

1. Poor contact between the display card and the display signal line

2. Display fault

3. When running in some software, the color is not normal, which is generally common on vintage machines. There is a color check option in the BIOS. Turn it on.
4. damaged video card;

5. The display is magnetized. This kind of phenomenon is generally caused by an excessively close relationship with an object with magnetic properties. After magnetization, it may also lead to a deflection of the display screen.

Common Fault 4: Crash

This kind of failure is generally seen in incompatibility between the motherboard and the video card, or poor contact between the motherboard and the video card. incompatibility between the video card and other expansion cards also causes a crash.

Common Failure 5: Abnormal spots or patterns on the screen

This type of fault is generally caused by video card memory problems or poor contact between the video card and the motherboard. You need to clean the Gold finger part of the video card or change the video card.

Common Fault 6: loss of the graphics card driver

When the video card driver is loaded and runs for a period of time, the driver is automatically lost. This type of fault is generally caused by poor quality of the video card or incompatibility between the video card and the motherboard, as a result, the system is unstable or crashes. At this time, only the video card is changed.

In addition, there is a special case where the graphics driver can be loaded before, but after the graphics driver is loaded, it crashes when it enters Windows. You can replace the graphics card of another model. After loading the driver, insert the old graphics card to solve the problem. If such a fault cannot be solved, it indicates a registry fault. You can recover the registry or reinstall the operating system.

Sound Card

Common Fault 1: Silent Sound Card. Common causes of such faults include:

1. The default output of the driver is "mute ". Click the small sound icon in the lower-right corner of the screen, and the volume adjustment slider is displayed. The "mute" option is displayed below. Click the check box on the front to clear the check box in the box to pronounce the sound normally.

2. The sound card conflicts with other plug-in cards. The solution is to adjust the system resources used by the PnP card so that each card does not interfere with each other. Sometimes, when "device management" is enabled, although there is no yellow exclamation mark), the sound card does not sound, but there is a conflict, but the system does not check it out.

3. After Direct X is installed, the sound card cannot be voiced. This indicates that the sound card has poor compatibility with Direct X and the driver needs to be updated.

4. One channel is silent. Check whether the audio cable from the sound card to the speaker is disconnected.

Common Fault 2: The Sound Card emits too much noise. common causes of such a fault include:

1. The plug-in card is incorrect. The sound card cannot be closely integrated with the expansion slot of the Main Board due to the low-precision chassis manufacturing, sound card bezel manufacturing, or poor installation. Therefore, the "Golden finger" on the sound card is not in place with the expansion slot. This problem occurs on both the ISA card and PCI Card and is a common fault. Generally, pliers can be used for correction.

2. The source Speaker input is connected to the Speaker output end of the sound card. For an active speaker, it should be connected to the Line out end of the sound card. The output signal does not pass the power amplifier on the sound card, and the noise is much smaller. Some sound cards have only one output end. The Line out or Speaker depends on the jumper on the card. The default mode of the manufacturer is usually Speaker. Therefore, you need to unplug the sound card and adjust the jumper.

3. Windows drivers are not good. When installing the sound card driver, you need to select the "Driver provided by the manufacturer" instead of the "default Windows Driver". If you use the "Add new hardware" Method for installation, select "Install from disk" instead of the list box. If you have installed a driver for Windows, choose Control Panel> system> device management> sound, video, and game controller, select "Properties> driver> change driver> install from disk ". Insert the disk or disc attached to the sound card to the driver provided by the manufacturer.

Common Fault 3: The sound card cannot be used out-of-the-box"

1. Try to use new drivers or replacements. I once had a sound card. I couldn't install the driver on the original drive disk in Windows 98, so I had to replace it with the Creative SB16 driver. Everything works normally. Later, I upgraded to Windows Me and changed to Windows 2000.) The built-in sound card driver was normal.

2. the biggest headache is that the plug-and-play device is detected in Windows 9X, but it does not mean to help you install the driver. This driver cannot be used. In the future, this issue will be repeated every time you delete and reinstall it, and it cannot be solved by "adding new hardware. I disclosed a unique secret here: Enter the Win9xinfother directory and put the * about the sound card *. deleting all the inf files and then restarting them, and then manually installing them, this is a spirit, and has helped the lives of countless sound cards ...... Of course, you can also modify the registry for the same purpose.

3. the installation of the PnP sound card is not supported. It is also applicable to the PnP sound card that cannot be installed using the preceding PnP method.) go to the "control panel", "add Hardware", and "Next ", when the message "Do I need Windows to search for new hardware?" Select "no", and then select "sound, video, and game controller" from the list to use a drive disk or directly select the sound card type for installation.

Common Fault 4: playing CD without silence

1. completely silent. The "CD player" of Windows 98 is used to set the CD to silent, but the "CD player" works normally again. This indicates that the audio cable of the optical drive is not properly connected. Use a 4-core audio cable to connect the analog audio output of the CD-ROM and the CD-in on the card, which is included when purchasing the CD-ROM.

2. Only one sound channel exists. The optical drive output port generally has two lines of signal, and the two lines in the middle are the ground lines. Because the four colors of the audio signal line are generally different, you can find a one-to-one interface from the line color. If there is only one interface on the sound card or each interface does not match the audio line, you have to change the wiring sequence of the audio line. Generally, only two of the two lines can be swapped.

Common Fault 5: burst of PCI sound card

The general reason is that the PCI graphics card uses the Bus Master technology to increase the background noise during hard disk read/write, mouse movement, and other operations mounted on the PCI Bus. Solution: Turn off the Bus Master function of the PCI video card, change it to The AGP video card, and change the PCI sound card to the slot.

Common Fault 6: Abnormal recording

First, check whether the microphone is inserted into another Jack. Second, double-click the speaker and select "Properties> recording" on the menu to check whether the settings are correct. Next, in "Control Panel> multimedia> devices", adjust "mixer devices" and "line input devices" to "use" status. If the "Recording" option in "Multimedia> audio" is gray, it will be terrible, and of course there is no room for saving, you can try to add "ISA Plug and Play bus" in "Add new hardware> System Device". Simply install and restart the sound card with the card tool software.