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<blockquote data-quote="Procrastinus" data-source="post: 1950398" data-attributes="member: 409082">I have acquired a MacBook Pro 9,2 mid 2012 (A1278) running High Sierra and in very good cosmetic condition, but with a problem – it will not start regularly. Press the power button and absolutely nothing happens most of the time. If it does decide to boot (usually after a prolonged rest!) everything runs as it should – keyboard, trackpad,camera, etc.&nbsp; I have run all the keyboard combinations for NVRAM et al and been through the Apple list of disconnecting various cables whilst shorting the power pads. External keyboards don't help either. I have even removed the logic board to check for liquid spill and subsequent corrosion – nothing, it is spotless. Battery usage was in the 300's last time I looked and I have tried booting with power cable only.&nbsp; I did notice that the battery has been replaced at some time. I have also replaced the HDD cable as this can be a problem with this model.But I am starting to see a pattern in my sleepy laptop - it needs a good nights sleep!So first thing in the morning, it starts fine and runs as it should (CPU temp steady at around 45C).&nbsp;&nbsp; Restart works normally, but shut it down and that is it for the rest of the day!!Has anyone seen anything like this before?</blockquote>

[QUOTE="Procrastinus, post: 1950398, member: 409082"] I have acquired a MacBook Pro 9,2 mid 2012 (A1278) running High Sierra and in very good cosmetic condition, but with a problem – it will not start regularly. Press the power button and absolutely nothing happens most of the time. If it does decide to boot (usually after a prolonged rest!) everything runs as it should – keyboard, trackpad,camera, etc. I have run all the keyboard combinations for NVRAM [I]et al[/I] and been through the Apple list of disconnecting various cables whilst shorting the power pads. External keyboards don't help either. I have even removed the logic board to check for liquid spill and subsequent corrosion – nothing, it is spotless. Battery usage was in the 300's last time I looked and I have tried booting with power cable only. I did notice that the battery has been replaced at some time. I have also replaced the HDD cable as this can be a problem with this model. But I am starting to see a pattern in my sleepy laptop - it needs a good nights sleep! So first thing in the morning, it starts fine and runs as it should (CPU temp steady at around 45C). Restart works normally, but shut it down and that is it for the rest of the day!! Has anyone seen anything like this before? [/QUOTE]

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