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My 2017 27” iMac randomly powers down. One month after purchase it didn’t boot at all so apple replaced power supply after which it intermittently powers down without any sound or notice and at any time. Sometimes while booting up. A few days back apple changed the logicboard but that also didn’t solve the problem. I made a video of this issue https://youtu.be/uCr92WGQa0M
Any suggestions what could be wrong?
Esta é uma boa pergunta?
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This time around go to the Apple store and ask for a complete swap of your device.
This is not acceptable for this kind of expensive machines.
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They don’t want to do it. Their service is very poor
That's odd,
Did you go to an Apple Store or to a reseller ?
Resellers sometimes refuse this kind of things but not a Store.
You have to convince them that you will no go away until they do something.
I've seen that sometimes will do something for you if you insit enough so go to an Apple store and "cry" a little bit, usually thiçs works when there is a lot of customers in the Store ;) its all about selling
yeah I went to an Apple store. I did "cry" last time but may be more next time :) For sure I'll be talking to a manager next time
Finally got a swap after I took the device for repair the fourth time.
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Just for dotting the i's and crossing the t's check your outlets wiring.
Make sure the black wire is tied to the brass screw and the white is on the silver, also check the ground wire is attached as well. Then go to your fuse/beaker panel and locate the fuse/breaker is it 20 Amp's? Then check the panels grounding connection to the physical ground making sure its all in good shape. A common problem is the grounding rod corrodes up which makes it useless.
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Thanks for the detailed answer @danj but I live in an apartment building so can't check all of these. I can run a few checks but I know other people in my building also own iMac and no one ever complained about such a problem
It's possible your units wiring if bad Vs your neighbors. You could get an outlet tester at the hardware store or online to at least be sure.
Yeah I think I'll check the outlet. Can outlet issue cause iMac to shutdown even after using a UPS? I bought a UPS recently and there's no change in power down pattern.
It depends on the type of UPS you got. There are two kinds one that kicks in when the power goes out (cheaper) and the ones that fill in for dirty power (more expensive).
A loose contact or mis-wired outlet or even bad ground can confuse your UPS. I would also try a different power cord that feeds your iMac.
I use the APC BackUPS Pro as my power in my part of the city is quite bad. I get surges, brownouts & my lights flicker all three conditions of poor power.
Sometimes we jump over the AC power aspect of the puzzle. Thats not to say your issue is AC power here, it still could be within the computer, we're just making sure the external influencers are not the problem.
Yeah I also use APC backup pro and it has a building wiring fault indicator which didn’t light up ever. Also UPS never makes any sound before/after shutdown. In last repair with apple I left my power cord with them and told them to check if it’s a power cord problem but they replaced logicboard
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