Solving the Mysterious Shutdown Issue on My Late 2013 iMac 27

As an avid user of my Late 2013 iMac 27, I was baffled when it started shutting down unexpectedly. Despite trying various troubleshooting methods and seeking assistance from Apple resellers, the issue persisted. In this article, I'll recount my experience and share the surprising solution that finally resolved the problem.

The journey began with a thorough investigation of my console logs. The first 25 lines of logs revealed nothing out of the ordinary before the shutdown occurred. I had already attempted SMC and PRAM resets, which is usually a good starting point for troubleshooting. Additionally, I formatted the Solid-State Drive (SSD) and reinstalled macOS High Sierra, but the shutdown issue remained.

Next, I checked for any malware or viruses on my computer using various programs. Each scan revealed no signs of malicious software, indicating that the issue was likely related to either hardware or software. To rule out any potential hardware issues, I ran the Apple Hardware Test. The only finding was a warning about the battery, which seemed unrelated to the shutdown problem.

Despite exhausting all obvious avenues, the shutdowns continued. It wasn't until I removed f.lux, a popular app that adjusts screen color temperature based on the time of day, that the issue miraculously resolved itself. I had been using f.lux for an extended period without any issues prior to the shutdowns, but it's clear that it was the culprit.

I took my iMac 27 to a local Apple reseller, who confirmed that they have seen similar issues with other users of the same model. The issue is likely related to a software conflict or bug, rather than a hardware problem. It's possible that f.lux was interfering with the operating system's shutdown process, causing the unexpected reboots.

In conclusion, my experience highlights the importance of thoroughly investigating potential causes and considering even seemingly unrelated factors. Removing f.lux resolved the issue for me, and I'm now able to use my iMac 27 without worrying about sudden shutdowns. If you're experiencing similar issues with your Late 2013 iMac 27 or any other Apple device, I encourage you to explore software conflicts as a potential solution.

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