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2.0GHz, 2.3GHz, or 2.6GHz quad-core Intel Core i7 processor (Turbo Boost up to 3.8GHz) with 6MB shared L3 cache.

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Cursor and keyboard are jittery and jumping across

Several keyboards and mouses I try that are wired or bluetooth keep actin erratically and jumping across the screen. both bluetooth and wired-- and several. i've tried reinstalling macOS and tried test user and it is system wide and very beyond annoying. the internal keyboard and trackpad work fine. i need the external keyboard and mouse because the screen is cracked and i use the mac in clamshell mode

your thoughts and insights to fix this?

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You may have a swelled battery which is pressing on the internal keyboards and/o trackpad cables. Let’s get a better view of things, install this gem of an app! CoconutBattery take a snapshot of the apps main window and post it here for us to see Adding images to an existing question

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