First check whether the VGA cable is tightly inserted or has broken pins! Try another if you can!
It is also possible that the screen cable connecting the VGA interface to the computer is faulty. Generally speaking, the problem of the two is more likely.
1.There is a problem with the graphics card driver
2. The graphics card fan is broken and the graphics card is overheating
3. The display is broken. Use the exclusion method and change the display. Or there is something wrong with your graphics card.
In this case, you probably have a problem with the graphics card. Try to adjust the screen refresh rate. Right-click "Properties"-> "Settings"-> "Advanced"-> "Monitor" on the desktop and install the driver to upgrade the graphics card. driver.
Check that the cable of the monitor to the computer is plugged in.
Check if the graphics card is cooling well.
Look down the display resolution or refresh rate.
The splash screen generally refers to a display problem on the computer monitor. During the operation of the computer, the screen image flickers or flickers irregularly, and sometimes horizontal lines and vertical lines appear. The splash screen and the snowflake screen are mainly caused by the problem of the graphics card. The snowflake screen is similar to the TV's snowflake screen. The splash screen is like a problem with the graphics card driver. Therefore, the graphics card should be repaired first, but the problem of the display itself is not ruled out.
1.The graphics card temperature is too high
Check whether the heat sink is working normally and remove the gray layer.
2, graphics driver issues
Update the graphics card driver or reinstall the driver (it is dangerous to update the driver, it may cause the computer to fail to boot, etc., do not try without experience)
3.The display refresh frequency is set too low
When the display's refresh frequency is set to less than 75Hz, the screen will often experience flickering and flickering. Adjust the refresh rate appropriately, for example, if it is set higher than 85Hz, the screen flicker will generally not appear again.
4.The power transformer is too close to the display and the chassis
When the power transformer works, it will cause large electromagnetic interference, which will cause screen jitter. Keeping the power transformer away from the case and display can solve the problem.
5.Inferior power supply or power equipment has aged
The components and materials used by many non-brand computer power supplies are very poor in workmanship and materials, which can easily cause the computer's circuit to be unsmooth or the power supply capacity to keep up. When the system is busy, the display will experience screen jitter. When the computer's power supply starts to age, it can easily cause the same problem.
6. The speaker is placed too close to the display
The magnetic field effect of the speaker will interfere with the normal operation of the display, causing the display to generate magnetic interference such as screen jitter and cross-color.
7. Viruses make trouble
Some computer viruses can disturb the screen display, such as character inversion, screen jitter, and graphics flip display. Screen dithering scripts, which can be seen everywhere on the Internet, are enough to make your head as big as a bull.
8. Bad contact of graphics card
After reinserting the video card, the fault can be eliminated.
9. Caused by write cache after WIN95 / 98 system
If this is the case, disabling write-back caching for all drives in Control Panel-System-Performance-File System-Troubleshooting can solve the problem completely.
10.Power filter capacitor is damaged
Open the case, if you see the top of the power filter capacitor (the largest capacitor on the circuit board) bulging, then the capacitor is broken, and the screen shake is caused by a power failure. After changing the capacitor, the problem can be solved.