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Question: Trying to revive a mid 2011 iMac, keeps crashing after clean installs

Hi all,

First of all, thank you for reading this post and attempting to help. I am trying to help my father-in-law in resurrecting his mid 2011 27 inch iMac. He has been experiencing a problem where his computer will frequently reboot randomly when he is doing even the most simple of things like browsing the web. I read up a little bit on the issue and can't seem to figure out what is going wrong. I helped him to do a clean install of high sierra the other day and we have thus far only installed chrome and adobe's CC. While we were in the process of installing Illustrator the computer crashed again and gave us this Panic Report. I'm hoping someone can help me decode the problem so I can get him back on his merry way editing his photos.

Anonymous UUID: F53ECEBC-4DA7-AA01-897F-94F9A254FABE

Thu Mar 15 14:03:35 2018

*** Panic Report ***

panic(cpu 2 caller 0xffffff802969d6a7): "a freed zone element has been modified in zone cluster_write: expected 0xc0ffeef6a9a02afe but found 0xc0ffeef6a9a022fe, bits changed 0x800, at offset 0 of 248 in element 0xffffff806d0ad0f8, cookies 0x3f001176c4aaf2fe 0x53521c12240a9f7"@/BuildRoot/Library/Caches/ .41.2/osfmk/kern/zalloc.c:1120

Backtrace (CPU 2), Frame : Return Address

0xffffff9213b13430 : 0xffffff802964f606

0xffffff9213b13480 : 0xffffff802977c654

0xffffff9213b134c0 : 0xffffff802976e149

0xffffff9213b13540 : 0xffffff8029601120

0xffffff9213b13560 : 0xffffff802964f03c

0xffffff9213b13690 : 0xffffff802964edbc

0xffffff9213b136f0 : 0xffffff802969d6a7

0xffffff9213b13750 : 0xffffff802969d481

0xffffff9213b137a0 : 0xffffff802969ba03

0xffffff9213b138d0 : 0xffffff8029b17520

0xffffff9213b13920 : 0xffffff8029878b43

0xffffff9213b13a50 : 0xffffff80298782ef

0xffffff9213b13c50 : 0xffffff8029877275

0xffffff9213b13c80 : 0xffffff7faaefdd77

0xffffff9213b13d60 : 0xffffff80298bc330

0xffffff9213b13de0 : 0xffffff80298ade9a

0xffffff9213b13e40 : 0xffffff8029b42ca1

0xffffff9213b13ee0 : 0xffffff8029b42ada

0xffffff9213b13f40 : 0xffffff8029bfa978

0xffffff9213b13fa0 : 0xffffff8029601906

Kernel Extensions in backtrace:[CB6AC89F-23BE-30A4-9E90-5121A184925A]@ 0xffffff7faaede000->0xffffff7faaf44fff

dependency:[F1862033-F96A-398C-8231-DC48CC99056 7]@0xffffff7faaed6000

BSD process name corresponding to current thread: Setup

Mac OS version:


Kernel version:

Darwin Kernel Version 17.4.0: Sun Dec 17 09:19:54 PST 2017; root:xnu-4570.41.2~1/RELEASE_X86_64

Kernel UUID: 18D901F1-4A03-3FF1-AE34-C26B2732F13C

Kernel slide: 0x0000000029200000

Kernel text base: 0xffffff8029400000

__HIB text base: 0xffffff8029300000

System model name: iMac12,2 (Mac-942B59F58194171B)

System uptime in nanoseconds: 1859951851752

last loaded kext at 1345393718042: 3 (addr 0xffffff7fabfd8000, size 32768)

last unloaded kext at 1785336016221: 3 (addr 0xffffff7fabfd8000, size 32768)

loaded kexts: 1.9.5d0 1.70 3.16.2 1 1.0.1 3.6.4 6.0.2f2 1.6.0 7.0.0 1.6.0 131 110.23.30 1 10.0.4 280.12 280.12 1 1.6.0 3.1.1 170.10.2 1.0.0 10.3.1 211 1 700.74.5 3.1 1.0.0 4.0.0 10.0.4 1.5.3 3.0 439.30.4 404.30.2 352 1.0.0d1 1.0.0 40 407.30.1 5.5.8 329 6.1 2.0 1.8 2.1 6.1 1.7 220.0.0 183 3 8 220.0.0 1 11 376.6 209.2.2 1.0 280.12 526 3.16.2 3.16.21 1.1.0 517.22 280.12 280.12 206.5 1.2.0 2.2.8 1.1.0 1.0.1b8 1200.12.2 1.0.4 1.0.14d1 1.0.0 6.0.0d8 1.6.0 1.0.0 4.1.2 1.0.18d1 517.22 1.0 404.30.2 1.8 1.8 1.8 267 6.0.2f2 6.0.2f2 6.0.2f2 6.0.2f2 1.2 5.0.0 1.2 1.2 1 5.0.2 5.0.2 5.0.2 2.1.3 301.40.2 4.5.6 6.6.3 4.6.8 288 1.2 1.2 1.0 900.4.1 1.2 2.1 2.0.0 2.1 1.1 300.0 1.0.0d1 28.30 1.0 2 439.30.4 1.0.5 140.30.1 404.30.2 404.30.2 1.0 1 1.2 1.0 1.0 1.0.1 1 1 480.30.2 2.1 650.5 3.4 31 6.1 1.0 3.1.9 2.9 1.4 1 1 1.0


System Profile:

Network Service: Wi-Fi, AirPort, en1

Thunderbolt Bus: iMac, Apple Inc., 22.1

Boot Volume File System Type: hfs

Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x029E, 0x434D534F344758334D314131333333433920

Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x029E, 0x434D534F344758334D314131333333433920

Memory Module: BANK 0/DIMM1, 4 GB, DDR3, 1333 MHz, 0x029E, 0x434D534F344758334D314131333333433920

Memory Module: BANK 1/DIMM1, 4 GB, DDR3, 1333 MHz, 0x029E, 0x434D534F344758334D314131333333433920

USB Device: USB 2.0 Bus

USB Device: FaceTime HD Camera (Built-in)

USB Device: Hub

USB Device: Dell USB Keyboard

USB Device: BRCM2046 Hub

USB Device: Bluetooth USB Host Controller

USB Device: USB 2.0 Bus

USB Device: Hub

USB Device: USB Optical Mouse

USB Device: Cruzer Fit

USB Device: IR Receiver

USB Device: Internal Memory Card Reader

Serial ATA Device: ST4000DX001-1CE168, 4 TB

Serial ATA Device: HL-DT-STDVDRW GA32N

Model: iMac12,2, BootROM IM121.004D.B00, 4 processors, Intel Core i7, 3.4 GHz, 16 GB, SMC 1.72f1

Graphics: Intel HD Graphics 3000, Intel HD Graphics 3000, Built-In

Graphics: AMD Radeon HD 6970M, AMD Radeon HD 6970M, PCIe, 2 GB

AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x9A), Atheros 9380:

Bluetooth: Version 6.0.2f2, 3 services, 27 devices, 1 incoming serial ports

Again, any help at all is greatly appreciated. All the best,


iMac, macOS High Sierra version 10.13.3

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Mar 15, 2018 1:40 PM in response to livingstone87 In response to livingstone87

First thoughts are: HDD is dying and/or defective memory module.

A Troubleshooting Procedure that may Fix Problems with 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.
  3. Resetting your Mac’s PRAM and NVRAM
  4. Reset the System Management Controller (SMC)
  5. Reset your Startup Disk and Sound preferences.
  6. Start the computer in Safe Mode. Test in safe mode to see if the problem persists, then restart normally.
  7. Use Apple Hardware Test to see if there is any hardware malfunction.
  8. 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.
  9. Repair permissions on the Home folder: Resolve issues caused by changing the permissions of items in your home folder.
  10. 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.
  11. 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.
  12. 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.
  13. 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.

If none of the above helps then make an appointment at the Apple Genius Bar for service. If you need to find an Apple Store - Find a Store - Apple.

Mar 15, 2018 1:40 PM

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Question: Trying to revive a mid 2011 iMac, keeps crashing after clean installs