Why does the monitor screen suddenly no longer have a resolution of 1280*960?

Try to adjust the hardware acceleration

Open Display Properties-Advanced-Troubleshooting, drag the hardware acceleration level slider a little to the left, and confirm

No Drag to the left

In addition, your resolution suddenly disappears from 1280*960. It is recommended to reinstall the graphics card driver

However, the resolution of 1280*960 is rare, usually 1280*1024 (normal screen), 1440*900 (widescreen)