If your desktop computer is displaying distorted images or text, there is a chance that an operating system problem is the cause. The best way to start troubleshooting is to restart your computer. This simple step often fixes most of the computer's issues. You can also adjust your PC's screen settings and preferences in the settings application.
Through this tool, you can identify and detect monitors or connect to a wireless display. If the monitor cable is damaged, it may cause a distorted line on the screen. To check if this is the case, try connecting one monitor to a new computer and the other to an old computer. If the screen looks much better on the old computer, then it is likely due to a physical problem on the monitor itself or on the video card.
If you are experiencing major discoloration or distortion problems, such as blurred desktop icons, blurry text, and an overall dirty look, then it is time to take your computer to a professional for repair.