Chosen Solution

So around the two year mark I beginning to have a problem where my iMac it keeps turning off on me. I’m currently running El Capitan on it and after 3 visits to Apple Store they have failed to fix my iMac and replicate the problem. The issue with it is that it turns off after several months or even after a few days. I never not know when it’s going to turn off and I confirmed that has nothing to do with anything I’ve installed or with the programs I run. The people at the Apple Store suggested that I replace the logic board because they suspected it was a bad logic board. So I got it replaced free of charge because it’s covered under Apple Care. I looked into the problem I have online and I’m not the only one with this problem. There are other people with the same model as mine or similar model as having this same issue. I came across one person that had fixed the problem by finding out that it was a power supply failure. I’m not sure it could be that. I was also told that it could be inconsistent flow of power. So I went back home to plug it into a surge protector and still turned off while I was using it even when it was plugged into a surge protector.

Surge suppressors only prevent excessive power to enter your system it does not solve the lack of power or if the frequency of the power changes. This is were a UPS make a difference! Unlike a surge suppressor it fills in the power when it goes low or correct the frequency. There are different types of UPS’s the cheaper units only kick in when the power is gone (power failure) the better units offer the fill in and frequency sync. As an example I have APC’s Back-UPS Pro units for my systems as living in the city I have poor power. Even still, I would recommend you get an electrician in to have him check your house wiring. He can make sure your outlet you are using for your system is able to support the load (20 Amp for 120 Volts) and is properly grounded at the outlet as well as the fuse/breaker panel is properly grounded as well. Also make sure the ground tie-in is up to spec it may need to be replaced or cleaned up as over time they do break down.

Almost certainly a power supply issue. We see this often. The only way to know for sure however, is to replace it :-(