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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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Is this wire necessary?

I was replacing my optical drive in my Mid 2011 27” iMac.

I’ve done some repairs on similar models before. Whilst putting the LCD back on I accidentally damaged the CPU Fan Ambient Temperature Sensor Cable 593-1361.

I thought it wouldn’t effect the iMac as it was only a trigger for the fans, and that I would replace it later.

When I turned the iMac on the fans became very aggressive and the iMac booted halfway and then the LCD turned off but the fans continued aggressively, I tried putting the iMac into safe mode, but it didn’t work. I then tried putting it into Internet recovery mode, and it completed the spinning earth cycle but froze on the Apple Logo.

I understand the wire is most likely the problem for the aggressive fans, but surely not for the half-booting LCD? Is it because of the CPU Fan Ambient Temperature Sensor Cable 593-1361 or is there another issue?

Answer this question I have this problem too

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OS Safe Mode is different not the same as hardware Safe Mode.

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Yes! The sensor is needed!

SMC requires the input, if it doesn’t see it SMC will push the system into Safe Mode, pushing the fan to the limit and lower the CPU’s clocking to a crawl!

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9 Comments:

Hi Dan, so It'll use the fan alot and lower the CPU, but why does it stop the mac from booting up?

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What where you doing to your system?

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Nothing, The DVD. player. wasn't working so I replaced it

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OK, what drive did you put in?

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GA32N SATA Superdrive @danj

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Jup K will be eternally grateful.
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