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Ursprünglicher Beitrag von: Chris Green ,


You said click works, but can you also move the mouse pointer around with one finger?  If so, test to see if [https://support.apple.com/en-us/HT204895|other multitouch gestures] work.  If any of them work you can rule out the possibility of a hardware problem.  There could also be an issue with Mac OS X settings that is causing multitouch not to work properly.  If you have OS X install media ([https://support.apple.com/en-us/HT201372|or the ability to create a bootable USB drive]), boot the computer off of that and see if the gestures work in the OS X installer.