The monitors you bought flashed white dots one by one.

This is generally the quality problem of the display itself, and jumper appears, which is generally caused by poor screen quality, or it may be caused by incorrect installation of the graphics card driver. Please update the driver of the discrete graphics card first, and try it out. If the monitor itself is still defective, you must send a warranty to replace it.

First, remove the monitor by replacing it, and test it on another computer to see if there is anything wrong with the monitor. If there is a fault, it can basically be determined that the display hardware is faulty and sent for repair. If it is ok to put it on another computer, the same phenomenon will occur when connecting other monitors to the faulty computer. It is recommended to check the video card. The problem is probably the video card. Secondly, there is another possibility, which is caused by the surrounding environment of the computer. Due to the poor shielding performance of this monitor, and the influence of the surrounding electromagnetic environment such as cell phone signals, a white bright line is generated. You can replace the data line of the monitor (buy a more expensive one with good shielding effect), or simply replace this monitor to solve the problem.