Hi, I followed the advice given by a technician. He changed the hard drive of the computer, a 13" MBP. The OS X was also installed. I haven't changed the battery, even though the battery was already depleted. The tech- nician may have removed the battery. I don't recall it now, the hard drive change may have been done about six or seven months ago. The thing is that as soon as I plug the chord to both the current outlet and to the computer, it turns itself on without pressing the power button, without being asked for ; ) !!! Could it wait until I press the power button or is it only possible until I get a new battery? Thank you, kind regards, igmolinav : ) !!!