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Model A1419 / Late 2012 / 2.9 & 3.2 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac13,2

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Replaced HDD with SSD. Fan keeps running, no boot.

Finished replacing the WD HDD in my Late 2012 iMac with a Crucial 1Tb SSD. I THINK I reassembled everything correctly but when I powered up I got the chime but nothing else except a running fan at full tilt and a black screen. I replaced the drive because I only got a partial boot before the system powered down. I took it to an Apple Genius who determined the original HHD was dead, not spinning. I reset the display power and data cables securely. Any thoughts on what I can do to wake this thing up?

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Switching out the HDD for a SSD is a great way to get the most bang out of your system! But… You need to replace the HDD’s thermal sensor for the systems thermal management to work properly iMac Intel 21.5" and 27" (Late 2012-Early 2019) SSD Temperature Sensor which is why your systems fan is running hard.

But you also have a second issue here with the display, did you follow this guide to the letter? iMac Intel 27" EMC 2546 Vervanging van het scherm or this one iMac Intel 27" EMC 2546 Vervanging van de harde schijf as you can damage the display if you don’t use the correct tools and technique as outlined.

If you have access to an external display see if it is working, hopefully its just a cable issue.

Once you get the display issue resolved you should then be able to install a fresh OS using Internet recovery following this Apple TN How to reinstall macOS

iMac Intel 21.5" and 27" (Late 2012-Early 2019) SSD Temperature Sensor Afbeelding

Product

iMac Intel 21.5" and 27" (Late 2012-Early 2019) SSD Temperature Sensor

$39.99

iMac Intel 27" EMC 2546 Scherm Afbeelding

Handleiding

iMac Intel 27" EMC 2546 Vervanging van het scherm

Moeilijkheid:

Moeilijk

1 - 2 hours

iMac Intel 27" EMC 2546 Vervanging van de harde schijf Afbeelding

Handleiding

iMac Intel 27" EMC 2546 Vervanging van de harde schijf

Moeilijkheid:

Moeilijk

1 hour

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HiYa,

Black screen and fans running full at boot means that you have not plugged in the LVDS cable properly (No video getting to screen and the thermal sensor of the screen is not being seen and so fans run at full)..

Re-seat the cable (the ribbon style one with the latch) and it should come back (unless you have damaged the cable in which case it may need replacing).

I have replaced many (MANY) hard drives in 2012-2019 iMacs and only seen 2 which needed the thermal sensor - in both cases the fan was running a few 100 rpm faster than the stock setup and being used in a very quiet environment - cottage on a hill style and acoustic music studio) - most people don’t even hear the difference.

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So I'm getting conflicting advice re: the need for temperature fan control, which I guess is to be expected in online forums. To be safe I have ordered a sensor and plan to install it.

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I have never seen any errors caused by having the sensor - also have installed of the order of 400 or so HDD to SSD upgrades and only seen the two which "need" it.

OWC obviously think it is needed (otherwise they wouldn't make it). I have just not seen any evidence. On the 2009-2011 the fans ran at full speed without some kind of mitigation - the 2012 - 2019s don't show this at all; they seem to run the fan a little faster (usually reports 1300 rpm in things like iStat Menu vs 1100 rpm with the stock drive) but for most environments that is not an audible difference.

Good luck.

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Bob Enders zal eeuwig dankbaar zijn.
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