Random black screen...AHT shows 4MOT/40000003: HDD-1333

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iMac Intel 27" EMC 2429

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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Nick @chewbaca

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Posted: Mar 1, 2019

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Random black screen...AHT shows 4MOT/40000003: HDD-1333

Have been experiencing random black screen upon waking the computer up from a longer period of sleep 10-12 hours. Screen initially lights and then goes black. Thought it may be the GPU (AMD Radeon 6970M 2gb) so ran the AHT to see if it came back with anything on it but instead got 4MOT/40000003: HDD-1333. From what I've found online this seems to be the hard drive fan behind the motherboard. This imac was special ordered with two drives, SSD with the OS on it and then a secondary HDD. Do you think replacing the fan will fix the black screen issue? Is there a fan for each hard drive in the computer or are they stacked in the same location? Thoughts on what this may be and possible fixes?

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Have you changed a hard drive?

Mar 2, 2019 by mayer

Nope. Factory SSD and HDD.

Mar 2, 2019 by Nick

Part of the problem is I'm not sure which drive would need replaced if one does, since there's two and AHT doesn't tell you much along those lines....

Mar 2, 2019 by Nick

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mayer @mayer

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Posted: Mar 2, 2019

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This model had major GPU issues and had a Apple repair program for replace it (of course, now expired). Hook it up to an external monitor to help isolate the issue. If the external exhibits to same issue, you will need to replace or repair (reflow) the GPU.

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Thanks! Yes I saw the repair program when googling the issue but as you said it's expired unless you're in new Zealand…found a new GPU off Mac parts depot…may try to open it up and replace that and the HDD fan at the same time and see if that doesn't fix it. Thanks!

Mar 2, 2019 by Nick

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Part of the problem is I'm not sure which drive would need replaced if one does, since there's two and AHT doesn't tell you much along those lines.... — Nick
Thanks! Yes I saw the repair program when googling the issue but as you said it's expired unless you're in new Zealand…found a new GPU off Mac parts depot…may try to open it up and replace that and the HDD fan at the same time and see if that doesn't fix it. Thanks! — Nick