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Question: iMac will not start up

iMac won't start up, I see the attached panic message - is it clear enough for anyone to offer a diagnosis?

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machine details:

iMac (27-inch, Late 2013) / OS X 10.11.1 / 3.5 GHz Intel Core i7 / 32 GB 1600 MHz DDR3 / NVIDIA GeForce GTX 775M 2048 MB / 3.12 TB

Fusion Drive (using 1.6tb) / s/n DGKLN1SLF8JC

iMac (27-inch Mid 2011), OS X Mountain Lion (10.8.2), 3.4GHz, 512GB SSD, 2TB SATA, 32gb

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Nov 14, 2017 12:44 PM in response to happysailor In response to happysailor

KP's can be caused by either hardware or software. Try restarting in Safe Mode and see if it launches. If it does not then please answer the following:

Was any third party RAM ever installed? If the answer is yes, please remove it and replace it with the original RAM that came with the computer. Then attempt restarting, if the problem persists then it's likely a hardware issue and your next step is to make an appointment at your local AASP and take it in for service.

Nov 14, 2017 12:44 PM

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Question: iMac will not start up