track pad has mind of it own
My track pad is not working. The curser is moving on it s own randomly around the screen. When I attach an external mouse, I can control the curser normally. thanks for any help.
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A swollen battery can adversely effect the trackpad mouse.
You have given very limited information—see if you qualify
https://support.apple.com/15-inch-macbook-pro-battery-recall
In or out of warranty you can get a free over the counter 'Apple Service Diagnostics' test /assessment
Make an appointment for a "hardware issue"—