My MacBook never had this problem until I replaced the magsafe adapter with an non-Apple charger (the Ostrich Replacement Macbook Charger 60w Magsafe L-Tip Power Adapter Charger) during the heat of summer. Whenever I was working the CPU heavily while the ambient air temperature was hot (20-25C or so), first the monitor would repeatedly shut off, and soon the entire machine would spontaneously shut down completely. The computer felt quite hot, so at first my solution was to shut it down for 20 or more minutes to let it cool off. But whenever I used the MacBook for long periods of time in hot temperatures, even this proved to be only a temporary solution. Ultimately, I ended resting the machine on top of a medical cold pack just to keep it running for an hour or less at a time. I then tried three of the solutions mentioned in this thread.
First, I tried resetting the PRAM, but this had no effect at all, as far as I could tell.
Second, I followed @jurgenkoppen's suggestion and downloaded smcFanControl, but unfortunately it didn't help nearly enough. I then switched to a different fan controller, MacsFanControl (https://www.crystalidea.com/macs-fan-con...), which worked much better. It's slightly more complicated to use than smcFanControl, but not by much; I set it to display the temperature of the CPU Diode, which consistently ran very hot very quickly, and I set the exhaust fan to run on auto. These steps immediately began to cool down the whole computer, and maintained a relatively lower temperature.
Third, after reading that a faulty power adapter could be responsible, and realizing that I had just recently replaced mine, I tried removing the power adapter and running off the battery. The result was striking: whenever the power adapter was in use, the temperature would climb VERY high fairly quickly, but when the battery was in use, the temp would drop to significantly cooler levels.
My MacBook still runs too hot when I work it hard, probably because of faulty hardware, but it doesn't shut down anymore after I made these changes.
I've tried with PRAM reset (5 times) but nothing is changed. After a day the problem is here again. I've turned my iMac in sleep and resumed it.
At Genius bar a technician said to me:
A) it could be a problem the power cable of the monitor (about 100€)
B) ... or with the graphics card (about 200€)
C) ... or with monitor itself (about 300€)
I really don't know what I should do to repair it. This strange problems does not happends every time...it's random... and it's the same since months...
Hi Dan, I'm sorry to tell you the only way to get this fixed is by ringing Apple, even if your mac doesn't have a warranty. It is a real frustrating thing, you think maybe is fixable, but it's not. I have repaired computers for some time and i stopped it happening for a week, but then it went back. Apple replace me logic board first, but it still didn't fix it, Apple then replaced the graphics card and the screen and that has stopped it doing it. So contact Apple, tell them even an windows computer would last longer yeah right. And you didn't pay $3000 to have this happen 5 years down the track, be nice and good luck. All the best
If they don't fix it, is an expensive job to replace the 27" screen.
por Fireman Jim
Mine was doing this. I removed all the dust inside the computer, especially around the RAM slot, where it appears to take in fresh air. There was a lot of dust. Then I installed Mac fan control. Between those two actions, it has not shut down since, about 4 month and running.
I posted here Oct 2016 with my fix, ( dust removal and fan control) which worked until a week ago. That time the monitor shut off once when I was running multiple tasks. So, upon reboot, the screen came back on, and I set my fan control manually, increased the speed to about double, especially for the CPU. Seems to stay on as long as it gets the extra cooling....would be my conclusion.....but still openminded.
@jurgenkoppen - Sounds like you'll need to pull the GPU off so you can clean off the old thermal paste and replace the thermal pads with new ones
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