random zooming in and moving down system-wide.

spinako wrote:

obviously, there is a display. input devices are trackpad and keyboard. with either or both disconnected, behavior persists. there is no mouse. there has never been a mouse connected to this system. facetiousness is unhelpful.

Obvious the user may have forgotten what has been written

User wrote " even with keyboard and trackpad disconnected. "

Perhaps the user needs a little one on one with a human person

Then have a few suggestions ;

Start now and open an Apple Support Ticket as they are PAID  Apple Employees to deal will these types of issues . 

call 1 800 MyApple

Other location call Centres 

 Contact Apple for support and service

spinako wrote:

2018 mac mini i3. both ventura and sonoma, even with keyboard and trackpad disconnected.

any view that can zoom in, will zoom in, in any app, in steps. cmd+0 resets the view as expected, but immediately zooms in again.

any view that can scroll down, will scroll down and any drop menu selection that can move down, will move down from cursor position, repeatedly.

behavior persists across restarts, across a system upgrade, across NVRAM reset.

One mentions " keyboard and trackpad disconnected."

So it would seem logical there is a Mouse involved to perform such actions >> Zoom In

Check in System Setting >> Mouse and see of " Smart Zoom " is enabled

spinako wrote:

there has never been a mouse connected to this machine.

User wrote " keyboard and trackpad disconnected."

User wrote " never been a mouse connected to this machine. "

Seems impossible to Zoom without some type External Devices to affect this Zoom issue especially on the quoted " 2018 mac Mini i3 "

This computer has No Keyboard, No Trackpad or No Mouse

It is also a Headless computer - No Display