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Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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2 Power supply units died after SSD upgrade

Hi all,

I have been in the process of upgrading some half dozen production machines in my office. The info and experience on this site has been an incredible resource.

Primarily we are swapping out HDDs for SSD’s. They are all iMac mid-2011, 27”, mostly i5 machines and most of the upgrades went smoothly.

To cure the fan sensor issue I have been clipping the 1 and 4 wires on the SATA cable and connecting the wires and sealing off the other ends at the plug. I have one i7 that is a 3.4 GHz that has been giving me problems. It was working fine, but showing signs of a dying HDD.

We opened it up and swapped out the old dying HDD for the new SSD. When we went to restart nothing happened. The LEDs showed #1 illuminated. We checked the test points on #1 and #4 and had no voltage. We then checked on #1 and 11 and there was 12V, which is the opposite of what we expected.

As we did some tests, LED #1 then blinked on when power was connected and then went off when we tried to restart. Then we only got a single blink upon power. It seemed like our diagnostics were changing as we checked. Then we had nothing. We suspected the power supply, but info we found also pointed to logic board and/or possibly video card.

Our local mac repair/reseller had a similar model with the same power supply and we purchased it to test, figuring it was the quickest way back to a working machine.

We put everything back together and installed High Sierra without a problem. Everything was working as expected. We shut down and moved the machine to another area of the office and booted back up. We heard the chime, the boot started, and then it went dark.

I haven’t been able to open up the machine to view the LEDs yet, but it seems like the power supply failed. That seems like what we had just seen.

Can you think of anything that would have caused a power supply failure, twice? The machine had been fine before, but was showing signs of a failing HDD. All the other upgrades have gone without a hitch. Hope you all have some experience that can help. I will be able to open it back up shortly.

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First I don’t recommend altering the SATA cable as you had done. Sometimes alterations have consequences!

I prefer to use the OWC In-line Digital Thermal Sensor for iMac 2011 Hard Drive Upgrade as it offers SMC the needed input for either 3rd party HDD’s or SSD’s in the 2011 systems.

While hitting two power supply failures is rare, it can happen! Its the most exposed component to surge and lightning damage. Are you using Surge suppressors or better yet UPS’s for your systems? Have you had power issues lately? Flickering lights or power disruption?

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Thanks, Dan. I have some new information and will provide an update shortly. In the meantime I'm reconnecting the SATA cable just to rule that out. Any idea how to identify which wire needs to go together? Yes, consequences!

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The easiest way is to compare a good cable to the altered cable iMac 27" Hard Drive Power Cable Apple P/N 922-9852. Or just replace it.

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Edmund Einstein zal eeuwig dankbaar zijn.
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