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Helpful answers
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Dec 25, 2015 9:53 AM in response to alositoby Eric Root,Trackpad or Magic Trackpad is jumpy or erratic
Restart the computer holding down the command - option/alt - P - R keys before the gray screen appears. Continue to hold until you hear the startup chime for the second time.
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Dec 25, 2015 10:28 AM in response to Eric Rootby alosito,Yes, I saw your same post in other threads about the same issue. Sorry, none of this helps.