There are several possibilities: 1. The display refresh rate is set incorrectly. If the refresh rate is set too low, the screen will shake. The checking method is to click the blank area of the system desktop with the right mouse button, and click the "Properties" command from the pop-up right-click menu to enter the display property setting window. Click the "Settings" tab in this window, then click the "Advanced" button in the corresponding tab page that pops up later to open the advanced attribute setting interface of the display, and then click the "Display" tab, from which you can see that the refresh frequency of the display is set to "60", which is the reason for the continuous jitter of the display. Set the new frequency above "75", and then click OK to return to the desktop. In fact, the main reason for the display screen jitter is that the refresh frequency of the display is set below 75Hz. At this time, the screen often appears jitter and flicker. We just need to increase the refresh rate to above 75Hz, and the screen jitter will not appear again. Second, the graphics card driver is incorrect. Sometimes we enter the refresh frequency of the computer monitor, only to find that there is no refresh frequency to choose from. This is because the driver of the front graphics card is incorrect or too old. This problem is easy to appear when computers are purchased earlier. At this time, don't use the driver in the CD provided when you buy the computer. You can download the latest drivers of the corresponding graphics card from the Internet, then open the properties window of the system, click the device manager button in the hardware window to enter the device list interface of the system. Right-click the graphics card option in the interface, click the "Properties" command in the pop-up right-click menu, then click the "Driver" tab in the pop-up graphics card property setting window, and then click the "Update Driver" button in the corresponding tab page. Then, according to the wizard prompts, gradually update the graphics card driver to the latest version, and finally restart the computer system. If the driver is installed correctly, the option of displaying refresh rate will appear, and then set the refresh rate. Thirdly, the disturbance of magnetic field leads to display jitter. The display is easily disturbed by strong electric or magnetic fields. If the above two methods still can't solve the jitter problem, then it should be suspected that the screen jitter is caused by the magnetic field or electric field near the display. In order to eliminate all interference around the monitor, you can move the computer to an empty desk and then conduct a power-on test. If the screen jitter disappears, it means that there is strong electric or magnetic interference in the original place of your computer. Please be good at finding suspicious things near the computer (such as subwoofer, magnetic cup of speaker, etc.). Then turn off the monitor and turn it on several times to achieve the purpose of degaussing (at present, all monitors have automatic degaussing function when turned on). 4. The graphics card has poor contact. Open the chassis, pull the graphics card out of the slot, and then wipe the dust off the gold finger of the graphics card by hand. It is best to find a soft fine brush to gently clean all the dust on the surface of the graphics card, and then wipe it on the surface of the golden finger several times with clean rubber to remove the oxide layer on the surface of the golden finger. Finally, re-insert the graphics card into the motherboard slot and fix it on the chassis shell with screws. Restart the machine test, and the general fault can be solved. V. Display aging Sometimes, due to the age of the display used, jitter will also occur. In order to check whether the electronic components inside the monitor are aging, you can connect the faulty monitor to someone else's computer for testing. If the fault still disappears, the monitor is broken and needs maintenance. 6. Inferior power supply or power supply equipment has aged. The components and materials used in many computer power supplies with miscellaneous brands are poor in workmanship and materials, which can easily cause computer circuits to be blocked or the power supply capacity cannot keep up. When the system is busy, the display will especially appear the phenomenon of screen jitter. When the power supply equipment of the computer begins to age, it is easy to cause the same problem. At this time, you can change the power supply for testing.