iMac keeps shutting down

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Level 1

4 points

iMac keeps shutting down

I have an iMac (Retina 4k, 21.5", 2017) High Sierra 10.13.6 that keeps shutting itself down overnight. It takes a couple of times to reboot the next morning. Any suggestions on how to fix?

iMac 21.5″ 4K, macOS 10.13

Posted on Jun 22, 2020 9:26 PM

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Answer 1

Top-ranking reply

rkaufmann87

Level 10

143,350 points

Jun 23, 2020 7:38 AM in response to saltydays

It could be over heating or it could be a hardware issue such as a failing power supply. Technically the report does not show anything wrong other than you bought a base model iMac with only 8GB of RAM (the bare minimum to run Mac OS) and a glacially slow 5400 rpm HD and then you try and run professional (MS Office) apps on it. You can attempt to reset the NVRAM and restart in safe mode but I think you need to take it to your local Apple Authorized Service Provider to be professionally diagnosed.

How to reset NVRAM on your Mac

Use safe mode to isolate issues with your Mac

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Answer 2

rkaufmann87

Level 10

143,350 points

Jun 22, 2020 10:01 PM in response to saltydays

Please navigate to the Mac App Store or navigate to www.Etrecheck.com and download the free version of EtreCheck. Once you have you downloaded the app and installed it, please run the report and save it. This report will help us get a good idea what has been installed on your system and help us be able to diagnose what may be wrong.

When you have your report, you can attach it when you reply to this message and we can then review it and help you determine what is needed to get your system running well again.

For instructions on how to download your EtreCheck report and attach it to your reply to this message please click https://discussions.apple.com/docs/DOC-250000211

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Answer 3

saltydays Author

Level 1

4 points

Jun 22, 2020 10:37 PM in response to saltydays

EtreCheck version: 5.5.5 (5111)

Report generated: 2020-06-23 15:31:10

Download EtreCheck from https://etrecheck.com

Runtime: 3:26

Performance: Good

Sandbox: Enabled

Full drive access: Disabled

Problem: Other problem

Description:

iMac shuts down overnight

Major Issues: None

Minor Issues:

These issues do not need immediate attention but they may indicate future problems or opportunities for improvement.

Unsigned files - There are unsigned software files installed. Apple has said that unsigned software will not run by default in a future version of the operating system.

32-bit Apps - This machine has 32-bits apps will not work on macOS 10.15 "Catalina".

Limited drive access - More information may be available with Full Drive Access.

Kernel extensions present - This machine has kernel extensions that may not work in the future.

Sharing enabled - This machine has sharing services enabled that could be a security risk.

Hardware Information:

iMac (Retina 4K, 21.5-inch, 2017)

iMac Model: iMac18,2

3 GHz Intel Core i5 (i5-7400) CPU: 4-core

8 GB RAM - Upgradeable by an Apple Authorized Service Provider

BANK 0/DIMM0 - 4 GB DDR4 2400

BANK 1/DIMM0 - 4 GB DDR4 2400

report

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iMac keeps shutting down

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