Chosen Solution
as the title suggests, the macbook does not switch on unless I disconnect and reconnect the battery and then plug in the power cord. I thought it was a defect of the power button, but when the computer is on it works by activating the shutdown window. so I would exclude a keyboard defect, is it possible that the problem is in the on/off circuit? how can i verify that this is the case? what else can determine this behavior? ps: I tried the various reset procedures but they don’t work (the led on the power connector does not change color)
Led color not changing when trying to reset SMC and power button not working point to a charging circuit fault. If you have a multimeter you can probe the charging connector pins and post the outcome of your measurement, but it seems you’ll need a board repair or replacement.
When you mean activating shut down window, is this via the power button key on the keyboard or is it via pressing the shut down on the top left apple menu? If it is the latter then it’s most likely going to be a keyboard problem, make sure to test every key on the keyboard too.
