I replaced the trackpad and the new one had a strange behave: the arrow moves, the multi-touch works, but was not possible to click and when the arrow passes on the dock it doesn't react at all, then I plugged in an external mouse and the behave was the same (in few words it was impossible to use the computer).

Now I putted back the old trackpad and I work with the external mouse.

Did someone experienced something similar?

Did you solve in some way?

Thank you in advance.