First, the landlord set the resolution wrong. For example, the landlord used a widescreen monitor, but set the resolution to the resolution of the front screen by mistake-1024x768. At this time, the circle will become an ellipse. In this case, just change it to the correct widescreen resolution. The resolutions of monitors of different sizes are slightly different, so the landlord can ask.

Secondly, if the resolution of the monitor is correct and the circle is still oval, there may be something wrong with the monitor, but I personally think it is unlikely.

Your monitor is not recognized by the system. It is estimated that the driver is installed according to plug and play. You can download a driver from the monitor official website and adjust the resolution after installation. The display setting of the computer is wrong, that is, the resolution is wrong. Is the font displayed on your computer flat? ! Enter the control panel, display settings, display resolution, and just adjust it.