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Model A1419 / Late 2013 / 3.2 & 3.4 GHz Core i5 or 3.5 GHz Core i7 Processor, ID iMac14,2

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Broken screen on iMac 27 late 2013 problem with second screen

I have connected an external second screen on imac 27 late 2013 with a broken screen, but the imac does not open.  I do not see the logo and then the gray screen.  But if I isolate the broken imac screen by disconnecting its cables, then on the second screen I have a normal image and I see everything but the fans are full. Is there a way not to hear the fans? What should I do?  Thanks and sorry for my English

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Your system is designed with sensors to monitor your systems health. So when you disconnect your internal display screen, SMC looses access to the sensors within it. When it does it goes into CPU Safe mode! This is done to protect your system from over-heating. Ramping up the fans RPM as well as lowering the CPU’s clocking. You can’t alter this.

Basically, you need to replace your internal display. Here’s the needed part: 27” iMac LCD Display Assembly, Apple P/N 661-7169

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thank you Dan

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is it possible to control this problem with mac fan controller or other app?

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@nikmetax - Sorry you can't really. SMC is in control! It always wins!

You have no choices here..

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Nikos Metaxopoulos 将永远感激不已
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