Monitor refresh frequency is set too low When the display refresh frequency is set below 75Hz, the screen often appears jitter, flicker phenomenon, the refresh rate is properly adjusted higher, such as set to higher than 85Hz, the phenomenon of screen jitter generally does not appear.
When the power transformer is too close to the display and chassis, the power transformer will cause large electromagnetic interference, resulting in screen jitter.
The problem can be solved by placing the power transformer away from the case and display.
Inferior power supply or power supply equipment has been aging many miscellaneous computer power supply used components work, materials are very poor, easy to cause the computer circuit is not smooth or power supply ability can not keep up, when the system is busy, especially the display screen shake phenomenon.
A computer's power supply is prone to the same problem when it starts to age.
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 produce magnetic interference phenomena such as screen shake and crosstalk.
Some computer viruses can disrupt the screen display, such as: character inversion, screen jitter, graphics flip display, etc.
The screen-shaking scripts that can be found all over the Internet are enough to make you look like a bull when you get hit.
The fault can be removed after the poor contact of the display card is reinserted.
If this is the case for Windows 95\/98 system write after caching, disabling all drive write after caching in Control Panel - System - Performance - File System - Troubleshooting will allow the problem to be fundamentally resolved.
Open the case, if you see the top of the power filter capacitor (the largest capacitor on the board) bulge, then the capacitor is broken, and the screen jitter is caused by a power failure. After replacing the capacitor, the problem can be solved.