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iMac won't start/load past apple logo

I have an iMac here (it is used in an office) that shut down one day after work without the user having shut it down, and the next morning I tried turning it on and it gets to the apple logo and the progress bar gets about 1/4 of the way full and it won't go past that. I booted in recovery mode yesterday and reinstalled macOS but it seems to still not be updated to high Sierra. it is still on 10.12.6 even though I reinstalled the latest version. It worked after that yesterday but I came in this morning and had the same issue, it had shut itself down, and it won't load past the logo. I can start it in safe mode and login, today it gave ma a "your computer shut down because of a problem" message and I copied the error log and will put it in below. Can anyone read these error logs and help me figure out what's going on? I'm afraid it might be a hard drive issue and I might just have to take it to Apple, but I'd like to try everything I can first so ANY help or input is GREATLY APPRECIATED!!!! Thank you!!!! 🙂

*** MCA Error Report ***

CPU Machine Check Architecture Error Dump (CPU: Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz, CPUID: 0x906E9)

CATERR detected! No MCA data found.



*** Device Tree ***

{

"pcie_cfg_base" : "0xe0000000",

"pci_devices" :

{

"0x0" : "MCHC@0",

"0x8000" : "PEG0@1",

"0x10000" : "IGPU@2",

"0x100000" : "PEG0@1/IOPP/GFX0@0",

"0x101000" : "PEG0@1/IOPP/HDAU@0,1",

"0xa0000" : "XHC1@14",

"0xb0000" : "IMEI@16",

"0xb8000" : "SATA@17",

"0xd8000" : "RP17@1B",

"0xe0000" : "RP01@1C",

"0xfc000" : "SBUS@1F,4",

"0xe1000" : "RP02@1C,1",

"0x300000" : "RP01@1C/IOPP/ARPT@0",

"0xe4000" : "RP05@1C,4",

"0xf8000" : "LPCB@1F",

"0xfa000" : "PMCR@1F,2",

"0xfb000" : "HDEF@1F,3",

"0x200000" : "RP17@1B/IOPP/SSD0@0",

"0x400000" : "RP02@1C,1/IOPP/GIGE@0",

"0x401000" : "RP02@1C,1/IOPP/SDXC@0,1",

"0x500000" : "RP05@1C,4/IOPP/UPSB@0",

"0x600000" : "RP05@1C,4/IOPP/UPSB@0/IOPP/DSB0@0",

"0x608000" : "RP05@1C,4/IOPP/UPSB@0/IOPP/DSB1@1",

"0x620000" : "RP05@1C,4/IOPP/UPSB@0/IOPP/DSB4@4",

"0x610000" : "RP05@1C,4/IOPP/UPSB@0/IOPP/DSB2@2",

"0x800000" : "RP05@1C,4/IOPP/UPSB@0/IOPP/DSB0@0/IOPP/NHI0@0",

"0x700000" : "RP05@1C,4/IOPP/UPSB@0/IOPP/DSB2@2/IOPP/XHC2@0"

},

"device_mmio" :

{

"PCI0@0" :

[

{ "a" : "0xcf8", "s" : "0x8" }

],

"PCI0@0/AppleACPIPCI/PEG0@1/IOPP/GFX0@0" :

[

{ "a" : "0x7f80000000", "s" : "0x10000000" },

{ "a" : "0x7f90000000", "s" : "0x200000" },

{ "a" : "0x92600000", "s" : "0x40000" },

{ "a" : "0x92640000", "s" : "0x20000" }

],

"PCI0@0/AppleACPIPCI/PEG0@1/IOPP/HDAU@0,1" :

[

{ "a" : "0x92660000", "s" : "0x4000" }

],

"PCI0@0/AppleACPIPCI/IGPU@2" :

[

{ "a" : "0x7f91000000", "s" : "0x1000000" },

{ "a" : "0x7fa0000000", "s" : "0x10000000" }

],

"PCI0@0/AppleACPIPCI/XHC1@14" :

[

{ "a" : "0x7f90310000", "s" : "0x10000" }

],

"PCI0@0/AppleACPIPCI/IMEI@16" :

[

{ "a" : "0x7f90324000", "s" : "0x1000" }

],

"PCI0@0/AppleACPIPCI/SATA@17" :

[

{ "a" : "0x92728000", "s" : "0x2000" },

{ "a" : "0x9272c000", "s" : "0x100" },

{ "a" : "0x9272b800", "s" : "0x800" }

],

"PCI0@0/AppleACPIPCI/RP17@1B/IOPP/SSD0@0" :

[

{ "a" : "0x92500000", "s" : "0x4000" }

],

"PCI0@0/AppleACPIPCI/RP01@1C/IOPP/ARPT@0" :

[

{ "a" : "0x92400000", "s" : "0x8000" },

{ "a" : "0x92000000", "s" : "0x400000" }

],

"PCI0@0/AppleACPIPCI/RP02@1C,1/IOPP/GIGE@0" :

[

{ "a" : "0x7f90200000", "s" : "0x10000" },

{ "a" : "0x7f90210000", "s" : "0x10000" }

],

"PCI0@0/AppleACPIPCI/RP02@1C,1/IOPP/SDXC@0,1" :

[

{ "a" : "0x7f90220000", "s" : "0x10000" }

],

"PCI0@0/AppleACPIPCI/RP05@1C,4/IOPP/UPSB@0/IOPP/DSB0@0/IOPP/NHI0@0" :

[

{ "a" : "0x92900000", "s" : "0x40000" },

{ "a" : "0x92940000", "s" : "0x1000" }

],

"PCI0@0/AppleACPIPCI/RP05@1C,4/IOPP/UPSB@0/IOPP/DSB2@2/IOPP/XHC2@0" :

[

{ "a" : "0x92800000", "s" : "0x10000" }

],

"PCI0@0/AppleACPIPCI/PMCR@1F,2" :

[

{ "a" : "0x92724000", "s" : "0x4000" }

],

"PCI0@0/AppleACPIPCI/HDEF@1F,3" :

[

{ "a" : "0x7f90320000", "s" : "0x4000" },

{ "a" : "0x7f90300000", "s" : "0x10000" }

],

"PCI0@0/AppleACPIPCI/SBUS@1F,4" :

[

{ "a" : "0x7f90325000", "s" : "0x100" }

],

"DMAC" :

[

{ "a" : "0x0", "s" : "0x20" },

{ "a" : "0x81", "s" : "0x11" },

{ "a" : "0x93", "s" : "0xd" },

{ "a" : "0xc0", "s" : "0x20" }

],

"FWHD" :

[

{ "a" : "0xff000000", "s" : "0x1000000" }

],

"IPIC" :

[

{ "a" : "0x20", "s" : "0x2" },

{ "a" : "0x24", "s" : "0x2" },

{ "a" : "0x28", "s" : "0x2" },

{ "a" : "0x2c", "s" : "0x2" },

{ "a" : "0x30", "s" : "0x2" },

{ "a" : "0x34", "s" : "0x2" },

{ "a" : "0x38", "s" : "0x2" },

{ "a" : "0x3c", "s" : "0x2" },

{ "a" : "0xa0", "s" : "0x2" },

{ "a" : "0xa4", "s" : "0x2" },

{ "a" : "0xa8", "s" : "0x2" },

{ "a" : "0xac", "s" : "0x2" },

{ "a" : "0xb0", "s" : "0x2" },

{ "a" : "0xb4", "s" : "0x2" },

{ "a" : "0xb8", "s" : "0x2" },

{ "a" : "0xbc", "s" : "0x2" },

{ "a" : "0x4d0", "s" : "0x2" }

],

"MATH" :

[

{ "a" : "0xf0", "s" : "0x1" }

],

"LDRC" :

[

{ "a" : "0x2e", "s" : "0x2" },

{ "a" : "0x4e", "s" : "0x2" },

{ "a" : "0x61", "s" : "0x1" },

{ "a" : "0x63", "s" : "0x1" },

{ "a" : "0x65", "s" : "0x1" },

{ "a" : "0x67", "s" : "0x1" },

{ "a" : "0x80", "s" : "0x1" },

{ "a" : "0x92", "s" : "0x1" },

{ "a" : "0xb2", "s" : "0x2" },

{ "a" : "0xffff", "s" : "0x1" },

{ "a" : "0x1800", "s" : "0xff" },

{ "a" : "0x800", "s" : "0x80" }

],

"RTC" :

[

{ "a" : "0x70", "s" : "0x8" }

],

"TIMR" :

[

{ "a" : "0x40", "s" : "0x4" },

{ "a" : "0x50", "s" : "0x4" }

],

"SMC" :

[

{ "a" : "0x300", "s" : "0x20" },

{ "a" : "0xfef00000", "s" : "0x10000" }

],

"EC" :

[

{ "a" : "0x62", "s" : "0x1" },

{ "a" : "0x66", "s" : "0x1" }

],

"PDRC" :

[

{ "a" : "0xfed10000", "s" : "0x8000" },

{ "a" : "0xfed18000", "s" : "0x1000" },

{ "a" : "0xfed19000", "s" : "0x1000" },

{ "a" : "0xe0000000", "s" : "0x10000000" },

{ "a" : "0xfd000000", "s" : "0x1800000" },

{ "a" : "0xfed20000", "s" : "0x20000" },

{ "a" : "0xfed90000", "s" : "0x4000" },

{ "a" : "0xfed45000", "s" : "0x4b000" },

{ "a" : "0xff000000", "s" : "0x1000000" },

{ "a" : "0xfee00000", "s" : "0x100000" }

]

}

}



Model: iMac18,3, BootROM IM183.0153.B00, 4 processors, Intel Core i5, 3.4 GHz, 8 GB, SMC 2.41f1

Graphics: kHW_AMDRadeonPro570Item, Radeon Pro 570, PCIe, 4096 MB

Memory Module: BANK 0/DIMM0, 4 GB, DDR4, 2400 MHz, 0x802C, 0x344154463531323634485A2D3247334232202020

Memory Module: BANK 1/DIMM0, 4 GB, DDR4, 2400 MHz, 0x802C, 0x344154463531323634485A2D3247334232202020

AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x16F), Broadcom BCM43xx 1.0 (7.21.171.130.1a1)

Bluetooth: Version 5.0.5f1, 3 services, 27 devices, 0 incoming serial ports

Network Service: Wi-Fi, AirPort, en1

Serial ATA Device: APPLE HDD ST1000DM003, 1 TB

USB Device: USB 3.0 Bus

USB Device: Bluetooth USB Host Controller

USB Device: FaceTime HD Camera (Built-in)

Thunderbolt Bus: iMac, Apple Inc., 22.1

iMac with Retina 5K display, macOS 10.12.6

Posted on Mar 2, 2018 7:44 AM

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1 reply

Mar 2, 2018 10:51 AM in response to jellybeen101

No one here can read those logs. They are intended for the engineers.


A Troubleshooting Protocol to Identify Problems or Fix macOS El Capitan or Later

You should try each, one at a time, then test to see if the problem is fixed before going on to the next.


Be sure to backup your files before proceeding if possible.


  1. Shutdown the computer, wait 30 seconds, restart the computer.
  2. Disconnect all third-party peripherals and remove any support software like drivers and plug-ins.
  3. Resetting your Mac’s PRAM and NVRAM
  4. Reset the System Management Controller (SMC)
  5. Start the computer in Safe Mode, then restart normally. This is slower than a standard startup.
  6. Repair the disk by booting from the Recovery HD. Immediately after the chime hold down the Command and R keys until the Utility Menu appears. Choose Disk Utility and click on the Continue button. Select the indented (usually, Macintosh HD) volume entry from the side list. Click on the First Aid button in the toolbar. Wait for the Done button to appear. Quit Disk Utility and return to the Utility Menu. Restart the computer from the Apple Menu.
  7. Create a New User Account Open Users & Groups preferences. Click on the lock icon and enter your Admin password when prompted. On the left under Current User click on the Add [+] button under Login Options. Setup a new Admin user account. Upon completion log out of your current account then log into the new account. If your problems cease, then consider switching to the new account and transferring your files to it - Transferring files from one User Account to another.
  8. Download and install the OS X El Capitan 10.11.6 Combo Update or 10.12.6 Combo Update or Download macOS High Sierra 10.13.3 Combo Update as needed.
  9. Reinstall OS X by booting from the Recovery HD using the Command and R keys. When the Utility Menu appears select Reinstall OS X then click on the Continue button.
  10. Erase and Install OS X Restart the computer. Immediately after the chime hold down the Command and R keys until the Apple logo appears. When the Utility Menu appears:
  1. Select Disk Utility from the Utility Menu and click on Continue button.
  2. When Disk Utility loads select the drive (out-dented entry) from the Device list.
  3. Click on the Erase icon in Disk Utility's toolbar. A panel will drop down.
  4. Set the Format type to APFS (for SSDs only) or Mac OS Extended (Journaled.)
  5. Click on the Apply button, then wait for the Done button to activate and click on it.
  6. Quit Disk Utility and return to the Utility Menu.
  7. Select Reinstall OS X and click on the Continue button.

iMac won't start/load past apple logo

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