Now Dell USB mouse doesn't work.
Downloaded optical mouse driver for this computer. Still no help.
Have removed the PS/2 Compatible Mouse (which is what shows up in Device Manager every time) and let the mouse reinstall.
There appear to be no BIOS settings that would help/matter.
There appear to be no keyboard actions that would help/matter.
I need to get it working.
The touchpad works.
There is no external keyboard connected.