Hi, my Macbook Pro (Mid 2012) automatically turns on/off for a couple of seconds when I remove/plug in the power cable. It turns on, the fan runs and after 10 sec it puts itself to sleep again. That happens every time when I connect or remove the Magsafe cable. A friend of mine has a Macbook that doesnt do that. What can I do that it doesnt switch on anymore when just plug in the cable?