uncontrolled scrolling

Sharingamacbook wrote:

my MacBook Pro won't stop scrolling when I release the up or down arrow

On an Intel Mac you can try resetting NVRAM/PRAM Reset NVRAM on your Mac - Apple Support

To trouble shoot further you can:

—Test issue in another user (or guest user) account Change Users & Groups settings on Mac - Apple Support

This will tell you if it a universal issue or isolated to your user/admin account. 

—A SafeBoot How to use safe mode on your Mac - Apple Support will sort many anomalies

does a quick disk repair before it fully boots up, and certain system caches get cleared and rebuilt, third party system modifications and system accelerations are disabled.

Login and test. Reboot as normal and test. Caches get rebuilt automatically.

If no insight or resolve plug in an external keyboard and compare your results.