What is the reason why the desktop computer has such a screen and cannot enter the system?

CMOS check sum error-defaults loaded means in Chinese: CMOS finds an error when performing all checks, and loads the system preset values.

CMOS Checksum Error-defaults Loaded Cause: An error was found when CMOS performed the sumsum check, which was mainly caused by the inconsistency between the settings in the BIOS and the real hardware data.

First of all, please press del to enter the CMOS settings when you boot up, and check whether the floppy drive option is none.

If it is none, then you load the default settings of CMOS, note that the default settings of CMOS are with floppy drive, which means that the system will automatically detect the floppy drive when it starts after the load is the default setting, so you should manually change the floppy drive device option to none after loading.

Next, press F10 to exit the save.

If it still doesn't work, it may be that the motherboard battery is out of power, and the CMOS information can't be saved, so you can change a battery for 3 yuan, or drive the machine for a while to let the motherboard charge the battery, but if the battery has been used for several years, change it!

There are six main reasons for the black screen of a desktop computer monitor: (the following includes the methods of processing).

The first reason: it is possible that the connection between your host and the monitor is not well connected (especially the interface is not plugged in), and there may be a problem with this connection data cable, so it will not be displayed and the screen will be black, so you have to reconnect the data cable, or replace the data cable.

The second reason: due to the memory or graphics card's gold finger is oxidized, resulting in poor contact between the memory and the memory slot, the graphics card and the graphics card slot are in poor contact, and the lead to the inability to boot, it will naturally be black, the processing method: turn off the power, open the chassis, remove the memory and the independent graphics card, use the eraser to align the gold finger of the memory (that is, the part with the copper sheet) on both sides of the wipe a few times, and then insert them back, the independent graphics card is also processed in the same way, and then the chassis is installed, plugged in the wire, generally treated like this, OK, (take the memory diagram as follows:.)

The third reason: that is, the graphics card's video memory is soldered, the performance of the main chip is reduced, the graphics card BIOS is disordered, and the control power supply IC is problematic, which will cause the graphics card to fail to work normally, that is, the graphics card is broken, and the computer will not be able to display, and the screen will be black when it is turned on.

The fourth reason: the problem of power supply, when the filter capacitor of the power supply bulges, leakage, there will be leakage, when the power supply is insufficient after starting, there is not enough voltage and current for the host to start, the power supply self-protection circuit starts self-protection, power off, no electricity, it is naturally a black screen, the treatment method, which can only replace the power supply.

The fifth reason: if the host is normal, the connection line is also normal, or the black screen, which is the problem of the liquid crystal display, when the power supply circuit, the high-voltage board circuit, the drive board circuit, no matter which link has a problem, such as large filter capacitor bulging, switch tube open, high-voltage package open circuit, lamp damage, MCU chip damage, power supply regulator damage, poor screen cable contact, etc., will make the LCD screen appear black, so at this time, you can only repair the display. (If within the warranty period and after-sales service).

The sixth reason: that is, there is a problem with the boot circuit of the motherboard, or the CPU power supply is abnormal, the north bridge is damaged, etc., etc., etc., will cause the boot, black screen, and the host does not respond, the solution: is to repair the motherboard, (if it is in the warranty period and after-sales service).

Yours is most likely the second reason, which accounts for eighty percent of the black screen that turns on this season.

1. First of all, we conduct a comprehensive check on the connection between the computer monitor and the host, and plug each connection back to see if there is a connection problem.

2. If the fault still exists, then we need to open the chassis to see if the chassis contains metals and other substances, causing a short circuit in the computer host circuit, and then we smell the computer to see if there is a burning smell, and see if there are damaged components around the motherboard and around the CPU.

3. After checking the whole chassis, there is no abnormality in the chassis, then we will dust the chassis.

4. If it can't be turned on, then use the minimum system method, unplug the data cable of the hard disk, floppy drive, and optical drive, and then check whether the computer can be turned on. Then connect the above devices to the computer one by one, when connecting a certain device, the fault will recur, indicating that the fault is caused by this device, and finally focus on checking this device.

5. If the fault still exists, it is likely to be the fault of the memory card, graphics card, CPU, motherboard, etc., at this time, we only need to plug and unplug these hardware, or replace it again, and try to find the cause one by one.

6. If the memory, graphics card, CPU and other devices are normal, then discharge the BIOS, use the isolation method, place the motherboard outside the chassis, connect the memory, graphics card, CPU, etc. for testing, if the computer can be displayed, then install the motherboard into the chassis for testing until the cause of the fault is found. If the fault persists, you need to return the motherboard to the manufacturer for repair.

7. When the computer is turned on and started, the system BIOS starts to POST (power-on self-test), and when a fatal error is detected in a device in the computer, it will control the speaker to send out a sound to report the error. Therefore, there may be a fault that the power is turned on without displaying an alarm sound. If the computer is turned on and there is no alarm sound, the fault can be checked according to the meaning of the BIOS alarm sound to check the faulty device to eliminate the fault.

If your computer monitor can't be turned on, make sure the power is plugged in, and the cable between the monitor and the computer is connected, if it's not these problems, then it is possible that the monitor is broken, or there is a problem with the graphics card.

First check whether the power indicator of the monitor is on, if it is not on, plug in the power cord again, if the monitor is powered but not displayed, check the data cable. If there is no problem, it is usually a problem with the host.

See if the contact is bad and see if the line behind is loose.

Press del. Go to the BIOS and take a look. Save exit in f10. See if you can enter the system. It is estimated that there is a problem with the BIOS settings or the hard disk is not recognized. If you have good English, you can check whether the hardware is normal in the BIOS.

This situation may be due to the fact that the computer cannot detect a certain hardware during the self-test or is stuck in the detection of a certain hardware.

1. Keyboard and mouse, the boot self-test will detect the mouse and keyboard, if there is a problem, it will cause the card to the self-test interface, the solution is to unplug the keyboard and mouse, check whether it passes the self-test, if it passes the self-test, replace the mouse and keyboard.

2. Hard disk and optical drive, the most likely is the hard disk and optical drive, the desktop needs to open the chassis, unplug the power cord of the hard disk optical drive to see if it passes the self-test, if it passes, further rule out the problem of hard disk or data cable.

3. If none of the above is true, then the most likely thing is that there is a problem with the motherboard BIOS and needs to be returned to the factory for repair.

It should be that the system boot information is missing. Workaround:

You can enter the PE and repair it with the software that comes with the PE. It is recommended to use Chinese cabbage PE.

The fundamental solution is to reinstall the system, and it is recommended to install it with the original image.

First of all, I tried unplugging peripherals such as keyboard and mouse, as well as hard disk optical drives.

The computer is turned on but the display screen does not light up, these reasons will teach you how to solve it!

If the indicator light of the host unit is on or off, and the screen is not displayed, it is generally due to poor contact of the memory module.

Suggestion: Turn on the case, replug the memory stick, and wipe the gold finger with an eraser (fingernails are also OK). If you can't do it, then it's simpler:

You can kick the chassis with one foot (pay attention to the location: the front of the shell on the left and right sides of the chassis that does not have an interface at the back).

Desktop monitor black screen solution 1:

1. The VGA connection of the monitor is loose.

In many cases, the display cannot be displayed because the connection between the host and the monitor is loose, so we can just connect it.

2. The memory module is loose or damaged.

Solution: Use an eraser to wipe the gold finger of the memory module and reinsert the memory stick; Replace the memory module.

3. The main engine is short-circuited.

Workaround: Clean up the host and replug the wiring.

4. Motherboard BIOS problems.

The motherboard BIOS stores important hardware data, and if it fails, it can cause the computer to not boot.

Solution: Go to the motherboard BIOS settings page and restore the BIOS to the default value.

The desktop computer is also powered on, why is there no image on the display.

1. The display suddenly goes black during the working process, but the indicator light of the monitor is always on, indicating that the real reason for the black screen is that the display is malfunctioning, that is:

1. High-voltage plate failure;

2. Backlight circuit failure;

3. AD driver board failure;

4. The power supply circuit failure in the above article;

If you can see the content displayed on the screen under bright light (or when you squint), the fault belongs to Article 3, otherwise it belongs to Article 3;

Second, the display is indeed an output part of the host point, but through the adjustment of the host, such as adjusting the resolution, refresh rate, etc., it will affect the use of the display;

If the refresh rate is turned up too high, the display will sometimes be burned.

Check whether the cable between the monitor and the main unit is loose.

Or if the fault is caused by poor hardware contact, it is recommended to perform the following operations:

1. Turn off the power, open the case, clean up the dust, especially the dust of the CPU fan, and check whether the CPU fan is rotating normally.

2. Power off, open the chassis, plug and unplug the memory, wipe the gold finger part with an eraser, and plug it back in (don't reverse it).

3. Plug and unplug the graphics card, wipe the gold finger part with an eraser, and reinsert it tightly (the buckle should be buckled).

4. Unplug the power cord, cut off the motherboard button battery, wait for three minutes, and then reinstall the motherboard.

5. If the above operations cannot solve the problem, it is recommended to send it to the maintenance center.

Hello, it is recommended to clean the computer thoroughly and replace the motherboard battery.

In this case, there may be a problem with the monitor or the graphics card on the computer, and you can troubleshoot the cause by following these steps:

1. Check the data interface behind the monitor to see if it is loose, plugged in tightly or unplugged and replugged.

2. If it is not displayed, connect the monitor to another host and see if it is displayed. If it is not displayed, it is a problem with the display and needs to be sent for repair, and if it is displayed normally, there is a problem with the graphics card.

3. Look at the back of the host, it is divided into independent graphics card and integrated graphics card, and the red frame below is the integrated graphics card, usually the display will be connected to it.

5. Use brushes and other tools to remove dust.

6. After reassembly, the display is normal, if it is not displayed, the graphics card needs to be sent for repair.

Let's try to change the monitor first.