Late 2013 iMac and image retention issues

I just purchased a certified refurb Sept 2013 iMac 27" 3.5GHz i7 3tb. I've already read the image retention advice on the Apple website (http://support.apple.com/kb/HT5455) and the problem keeps showing up. Additionally, I don't feel that I should have to keep such a close eye on my screen on such a new machine. I'm running a screen saver when I'm not on the computer, and I shut the display down if I'm leaving the computer for the day. I can't even have a desktop picture without seeing a burnt in image of the picture on my screen. Any help would be appreciated.

Since it has the same warranty as a new machine, contact Apple's Support and let them deal with problem. If less than 14 days old, you can return it w/o any questions being asked.
iMac refurb (27-inch Mid 2011), OS X Mavericks (10.9.4), SL & ML, G4 450 MP w/Leopard, 9.2.2

Similar Messages

Retina late 2013. Any Image retention?

I'm planning to upgrade my 2011 MBP 15'' AntiGlare with latest retina model, but could not find any reviews regarding image retention issue?
Has that been resolved yet?

Anyone? This is still a constant problem

Why does my iPad keeps connecting and disconnecting from the new late 2013 iMac

Hi there,
I've recently bought a new late 2013 iMac and ever since then I'm not able to connect my iPad 2 to it. When I do connect it keeps connecting and disconnecting again and again for some reason. The cable is fine and I've tried it with other devices. Just wondered why this is and whether you guys can help me out.
Thanks a lot!
CitizenJohnny

Hi,
I had the same problem and just found a solution. I tryed restoring all content and settings on the iPad (Settings > General > Reset > Erase All Content and Settings). It took lots of time, however it didn´t work because when I connected the iPad and iMac the problem persisted.
Then I thought it wasn´t an iPad problem but iMac OSX problem. So I searched the web for "Reinstall Mavericks" and found this http://support.apple.com/kb/PH13871?viewlocale=en_US&locale=en_US.
It also takes like 6 hours with my internet speed. Next day I connected the iPad and everything is just fine.
I described both processes because I don´t know if in the end the iPad reset helped in the solution.
Hope that helps! good luck

Late 2013 imac wont start up

I have a late 2013 imac, and I bootcamped it over 6 months ago, and haven't had any problems until now. My mac side hard drive only has like 50mb of space left, and when I try to get on the mac side, i log on, and then I just get stuck on a white screen. I dont know how to fix this, someone please help.

Welcome to Apple Support Communities
Try starting up in safe mode. To do this, hold the Shift key during the OS X startup until you see a line in the display. When OS X has started up, open Finder and remove the files you do not need or move some files to an external drive, so you can get free space

Image Persistence - Image Retention issues - iMac

Hello everyone. When is Apple going to fix all the image retention issues, or as Apple would call it image persistence? I find it to be horrendous that Apple is calling this "normal". There is nothing normal about having an image ghosted or stuck on your display. I hope Apple gets with LG on this and fixes these issues because a fix is long overdue. This has been plaguing iMacs for years now. I have had 2 iMacs in a row that have had this issue straight out of the box. Can anyone tell me why some IPS displays do this and others do not? Is this because Apple is buying junk from LG?
Have a look at these pages:
http://forums.macrumors.com/showthread.php?t=1853972
https://youtu.be/x2dafvZZC7Y

Image persistence on Apple displays:
http://support.apple.com/kb/HT5455
Apple say this about LCD screen burn in:
http://support.apple.com/kb/HT2807
which includes suggestions for curing that effect.
Alternatively:
How to fix screen burn and/or stuck pixels on an LCD monitor:
JScreenFix
http://www.jscreenfix.com/basic.php

Imac late 2013 crashes and restarts.

hello
I received my new imac there 2 days and it is completely unstable.
it crashes and restarts.
I tried with 16GB and 8GB with original but nothing changes.
have this kind of problems?
thanks
configuration:
IMac 27 "late 2013
Processor: 3.5 Ghz
crucial memory 32 GB
Fri Nov 8 12:46:00 2013
panic(cpu 0 caller 0xffffff8003edc19e): Kernel trap at 0xffffff83946ebcc0, type 14=page fault, registers:
CR0: 0x000000008001003b, CR2: 0xffffff83946ebcc0, CR3: 0x0000000006ad6000, CR4: 0x00000000001606e0
RAX: 0x0000000000000000, RBX: 0xffffff80441f49a8, RCX: 0x0000000000042933, RDX: 0xffffff80441d1370
RSP: 0xffffff83946ebca8, RBP: 0xffffff80442021a8, RSI: 0xffffff80441d1008, RDI: 0xffffff804415a008
R8: 0x00000000000057e8, R9: 0xffffff83946ebc3c, R10: 0xffffff83946ebe20, R11: 0xffffff7f84bda516
R12: 0xffffff83946ebd1c, R13: 0xffffff80441f49a8, R14: 0xffffff83946ebd14, R15: 0xffffff80441d1008
RFL: 0x0000000000010292, RIP: 0xffffff83946ebcc0, CS: 0x0000000000000008, SS: 0x0000000000000010
Fault CR2: 0xffffff83946ebcc0, Error code: 0x0000000000000011, Fault CPU: 0x0 Kernel NX fault
Backtrace (CPU 0), Frame : Return Address
0xffffff83946eb930 : 0xffffff8003e22f69
0xffffff83946eb9b0 : 0xffffff8003edc19e
0xffffff83946ebb80 : 0xffffff8003ef3606
0xffffff83946ebba0 : 0xffffff83946ebcc0
0xffffff80442021a8 : 0x8000000
No mapping exists for frame pointer
Backtrace terminated-invalid frame pointer 0x100000000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
13A603
Kernel version:
Darwin Kernel Version 13.0.0: Thu Sep 19 22:22:27 PDT 2013; root:xnu-2422.1.72~6/RELEASE_X86_64
Kernel UUID: 1D9369E3-D0A5-31B6-8D16-BFFBBB390393
Kernel slide:     0x0000000003c00000
Kernel text base: 0xffffff8003e00000
System model name: iMac14,2 (Mac-27ADBB7B4CEE8E61)
System uptime in nanoseconds: 25623295729719
last loaded kext at 19452793773068: com.apple.filesystems.afpfs          11.0 (addr 0xffffff7f8644e000, size 348160)
last unloaded kext at 14467405141563: com.apple.driver.AppleUSBCDC          4.2.1b2 (addr 0xffffff7f86430000, size 16384)
loaded kexts:
at.obdev.nke.LittleSnitch          4052
com.apple.filesystems.afpfs          11.0
com.apple.nke.asp-tcp          8.0.0
com.apple.driver.AppleBluetoothMultitouch          80.14
com.apple.driver.AudioAUUC          1.60
com.apple.driver.AppleHWSensor          1.9.5d0
com.apple.filesystems.autofs          3.0
com.apple.iokit.IOBluetoothSerialManager          4.2.0f6
com.apple.driver.AppleMikeyHIDDriver          124
com.apple.driver.AGPM          100.14.11
com.apple.driver.ApplePlatformEnabler          2.0.9d1
com.apple.driver.X86PlatformShim          1.0.0
com.apple.iokit.IOUserEthernet          1.0.0d1
com.apple.driver.AppleHDA          2.5.2fc2
com.apple.driver.AppleUSBDisplays          360.8.14
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport          4.2.0f6
com.apple.driver.AppleMikeyDriver          2.5.2fc2
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.AppleLPC          1.7.0
com.apple.driver.AppleSMCLMU          2.0.4d1
com.apple.driver.AppleHWAccess          1
com.apple.driver.AppleThunderboltIP          1.0.10
com.apple.GeForce          8.1.8
com.apple.driver.AppleUpstreamUserClient          3.5.13
com.apple.driver.AppleIntelHD5000Graphics          8.1.8
com.apple.driver.AppleIntelFramebufferAzul          8.1.8
com.apple.driver.AppleBacklight          170.3.5
com.apple.driver.AppleMCCSControl          1.1.12
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.BootCache          35
com.apple.driver.AppleUSBHub          650.4.4
com.apple.driver.XsanFilter          404
com.apple.iokit.IOAHCIBlockStorage          2.4.0
com.apple.driver.AppleSDXC          1.4.0
com.apple.iokit.AppleBCM5701Ethernet          3.6.9b9
com.apple.driver.AirPort.Brcm4360          800.21.45
com.apple.driver.AppleAHCIPort          2.9.5
com.apple.driver.AppleUSBXHCI          650.4.3
com.apple.driver.AppleRTC          2.0
com.apple.driver.AppleACPIButtons          2.0
com.apple.driver.AppleHPET          1.8
com.apple.driver.AppleSMBIOS          2.0
com.apple.driver.AppleACPIEC          2.0
com.apple.driver.AppleAPIC          1.7
com.apple.nke.applicationfirewall          153
com.apple.security.quarantine          3
com.apple.security.SecureRemotePassword          1.0
com.apple.driver.IOBluetoothHIDDriver          4.2.0f6
com.apple.driver.AppleMultitouchDriver          245.13
com.apple.kext.triggers          1.0
com.apple.iokit.IOSerialFamily          10.0.7
com.apple.driver.DspFuncLib          2.5.2fc2
com.apple.vecLib.kext          1.0.0
com.apple.iokit.IOBluetoothFamily          4.2.0f6
com.apple.iokit.IOBluetoothHostControllerUSBTransport          4.2.0f6
com.apple.driver.AppleUSBAudio          2.9.3f17
com.apple.iokit.IOAudioFamily          1.9.4fc11
com.apple.kext.OSvKernDSPLib          1.14
com.apple.driver.X86PlatformPlugin          1.0.0
com.apple.driver.IOPlatformPluginFamily          5.5.1d27
com.apple.driver.AppleHDAController          2.5.2fc2
com.apple.iokit.IOHDAFamily          2.5.2fc2
com.apple.driver.AppleSMC          3.1.6d1
com.apple.driver.AppleThunderboltEDMSink          1.2.1
com.apple.iokit.IOAcceleratorFamily          98.7.1
com.apple.driver.AppleSMBusPCI          1.0.12d1
com.apple.nvidia.driver.NVDAGK100Hal          8.1.8
com.apple.nvidia.driver.NVDAResman          8.1.8
com.apple.iokit.IOSurface          91
com.apple.iokit.IOAcceleratorFamily2          98.7.1
com.apple.AppleGraphicsDeviceControl          3.4.12
com.apple.driver.AppleBacklightExpert          1.0.4
com.apple.iokit.IONDRVSupport          2.3.6
com.apple.driver.AppleSMBusController          1.0.11d1
com.apple.iokit.IOGraphicsFamily          2.3.6
com.apple.driver.AppleUSBHIDKeyboard          170.15
com.apple.driver.AppleHIDKeyboard          170.15
com.apple.iokit.IOUSBHIDDriver          650.4.4
com.apple.iokit.IOSCSIArchitectureModelFamily          3.6.0
com.apple.driver.AppleThunderboltDPOutAdapter          2.5.0
com.apple.driver.AppleThunderboltDPInAdapter          2.5.0
com.apple.driver.AppleThunderboltDPAdapterFamily          2.5.0
com.apple.driver.AppleThunderboltPCIDownAdapter          1.4.0
com.apple.driver.AppleUSBMergeNub          650.4.0
com.apple.driver.AppleUSBComposite          650.4.0
com.apple.driver.CoreStorage          380
com.apple.iokit.IOUSBUserClient          650.4.4
com.apple.driver.AppleThunderboltNHI          1.9.2
com.apple.iokit.IOThunderboltFamily          2.8.5
com.apple.iokit.IOEthernetAVBController          1.0.3b3
com.apple.iokit.IO80211Family          600.34
com.apple.driver.mDNSOffloadUserClient          1.0.1b4
com.apple.iokit.IONetworkingFamily          3.2
com.apple.iokit.IOAHCIFamily          2.6.0
com.apple.iokit.IOUSBFamily          650.4.4
com.apple.driver.AppleEFINVRAM          2.0
com.apple.driver.AppleEFIRuntime          2.0
com.apple.iokit.IOHIDFamily          2.0.0
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          278.10
com.apple.kext.AppleMatch          1.0.0d1
com.apple.security.TMSafetyNet          7
com.apple.driver.AppleKeyStore          2
com.apple.driver.DiskImages          371.1
com.apple.iokit.IOStorageFamily          1.9
com.apple.iokit.IOReportFamily          21
com.apple.driver.AppleFDEKeyStore          28.30
com.apple.driver.AppleACPIPlatform          2.0
com.apple.iokit.IOPCIFamily          2.8
com.apple.iokit.IOACPIFamily          1.4
com.apple.kec.corecrypto          1.0
com.apple.kec.pthread          1

Looks like this is a hardware issue.
No word yet if it's Apple or Crucial's fault.
http://forum.crucial.com/t5/Apple-Mac-Memory/Late-2013-iMac-randomly-restarts-it self-once-a-day/td-p/136875/highlight/false/page/4

Mac OSX Mavericks 10.9 firewire audio problem on RME Fireface 800, MOTU 828 Mk II and Apogee Duet on late 2013 iMac i7

I just got the late 2013 iMac 3.5GHz Intel Core i7 and all my firewire based audio interfaces do not work properly although I upgraded to the latest drivers. iTunes or Youtube can play for a short and then there are unbrearable digital noises.
Apogee Duet is slightly better that can play for a few minutes. Then it may have short pause or digital noises. I need to reset the "Sample Rate" to other values to get it work again.
MOTU 828 mk II and RME Fireface 800 are having the most serious problems. Alternating the sample rate can sometimes help but often I need to reboot the iMac to get it work again. However, it works for only 1-2 minutes before the digital noises.
These are the software/drivers I installed:
- Apogee Maestro 2 version 2.8.8
- MOTU Universal Audio Installer for Mac OS X version 1.6.58373 (8/20/2013)
- RME version 3.19, firmware 2.77
I connect the fireware through Apple Thunderbolt to Firewire convertor.
These drivers are supposed to work with 10.9 but they don't. Anyone can help or share experience?

I've read in other forums that there are two issues that is causing this problem of chopping audio and freezing interfaces. One has to do with USB 2.0 /USB 3.0 issues in OS. The other seems to be an issue with the Fusion drive.
The fix for the fusion drive issue that has been shared online is to either:
Option #1. Don't use the fusion drive and create an external boot drive clone (either SSD or standard HD) and use as your primary drive (completely surpassing the internal fusion drive).
Option #2. Split the internal fusion drive. From there you can use them as two separate logical drives. Load your OS on one of the drives (SSD or HD). http://www.macworld.com/article/2015664/how-to-split-up-a-fusion-drive.html
Before, you do any of the above, make sure that you backup your current system setup.
I just received my imac (2013) with 3TB fusion and I plan on trying option #1. I bought a 3TB external USB drive which I plan to clone after I have the machine running. Once I clone the internal drive, I will test how the machine runs from both the internal fusion and the external to prove if this addresses the audio clipping/stopping problem. Hopefully, Apple will find a fix for this.
It is really a dissapointment that a brand new $2500+ machine and software was not tested to perform something that my 2008 MacBookPro and my home built Window XT machine (circa 2003) did without issue. I wished that I would have checked the forums about these issues before I purchased the machine.
You can do some searches online and find even more detail discussions on this topic.
Message was edited by: Juice5280

Problem installing Windows 7 64-bit on late 2013 iMac 27"

Is Windows 7 64-bit compatible with this computer?
Hardware and software:
• Late 2013 iMac 27", 3.5 GHz I7, 16 GB memory, 1 TB hard drive (no fusion drive)
• Mac OS 10.9.1
• USB thumb drive
• Boot Camp Assistant 5.1.0
• Windows 7 64-bit install disk iso image downloaded from Microsoft
Install steps:
1. Use Boot Camp Assistant to install Windows 7 install (from iso image) and Apple Support Software (creates WININSTALL USB drive)
2. Use Boot Camp Assistant to create 50 GB Windows partition on iMac internal drive and start Windows install
3. Complete initial install steps until given option to select install partition
4. Select 50 GB partition. Error message that partition is not formatted correctly. Use Advance Options to format (presumably to NTFS)
5. Select 50 GB partition again and click "Next"
6. Get error message "Setup was unable to create a new system partition or locate an existing system partition. See the Setup log files for more information."
7. Install quits at this point
I have successfully installed Win 7 on another computer (2010 Mac Pro) using these steps. I also tried installation on the iMac using an iso image created from my original Win 7 64-bit install disk, with the same installation error as above.
I'm wondering if Windows 7 and/or Boot Camp is compatible with this iMac. Any suggestions will be appreciated.

I am awaiting delivery on the exact model you have and have been researching how much trouble it will be to put 64 bit windows 7 ultimate on my machine when it gets here. I'm not pleased at what I've been reading so far. I have not seen the two other posts but yours is enough to concern me.
Have you also seen that 10.9.1 update may be responsible for this? I've seen where 10.9 caused some problems with the bootcamp app but then the process was completely hosed with the 10.9.1 update. Are you seeing this as well?
Being a life-long mac dude, it pains me when their stuff just doesn't work because it usually just does. ****, that's why I started on a mac in the first place.
The support site says that they come with 90 days of complimentary support. Is this not an issue they should be responsible for addressing via support? Or is that just one long wait on hold waiting to talk to somebody that won't consider this a pure apple issue?
I was also curious if your install .iso contains both 32 and 64 bit versions?

Installing Windows 7 on Late 2013 iMac w/ Fusion Drive

Sorry in advance for the long post, but I have tried to exhaust all possibilities, and bring as much knowledge about our environment to the table to avoid confusion.
Here's our goal: Install Mac & Windows on a Late 2013 iMac with a 1TB Fusion Drive
Install our Mac Image with Deepfreeze on Partition 1
Install our Windows 7 x64 Image with DeepFreeze on Partition 2
Here's why our goal cannot work out of the box:
Deepfreeze for Mac, is not supported on a Fusion Drive. Now before anyone says "just don't use deepfreeze"...we are using it, and that is that.
In order to get our existing image to work on the iMac, we had to split the Fusion Drive.
Splitting Up the Fusion Drive
We booted into Recovery, Opened up terminal, retrieved the LvGUID, deleted it, and split up the SSD from the HD.
So now, we have a 128GB SSD, and 1TB HD showing up under Diskutilitiy.
We then partitioned the 1TB HD, into two, 500GB Partitions. One for Mac OSX 10.9.4, and the other for Windows.
The 128GB SSD is going to be used for scratch space, temp, etc. And is irrelevant at this time.
Deploying our Mac Image
After splitting the Fusion Drive, we netbooted and installed a "NetRestore" of our image. Worked completely fine, no issues. DeepFreeze Works fine, the 128GB SSD shows up just fine, and the other 500GB Windows Partition shows up fine. All drives / partitions can be written to with no problem.
Deploying our Windows Image
Deployed our Windows Partition image as we have done in the past, by booting into a windows PE Disk. (We have other various 2009, 2010, and 2011 iMacs across campus, with NO FUSION DRIVES installed, and dual boot them successfully using the same procedure. Minus the splitting of the fusion drive part of course) After the Windows image is deployed to the windows partition, we then boot it up to a Windows 7 Install disk to fix the MBR, Bootrec, and BCD options to allow it to boot properly. Here's where we run into issues: Upon getting the Windows 7 Install screen, the USB Keyboard and Mouse, DO NOT WORK.
Here's the options we've tried to get them to work properly
1. Tried another known working Mac USB Keyboard & Mouse = Failed
2. Tried a known working Windows Keyboard & Mouse = Failed
3. Plugged Just a known working Mac Keyboard into each USB Port to see if recognized = Failed
4. Plugged Just a known working Windows Keyboard into each USB Port to see if recognized = Failed
5. Plugged Just a known working Mac Mouse into each USB Port to see if recognized = Failed
6. Plugged Just a known working Windows Mouse into each USB Port to see if recognized = Failed
7. A Windows 8.1 Recovery USB will boot and the USB Mouse & Keyboard are recognized and installed! (YAY!!) However, we cannot repair a Windows 7 install with Windows 8.1..
BootCamp Drivers & Support Media
Downloaded the Current BootCamp Support drivers to enable the USB and other various drivers to be loaded during setup (Placed the $WinPEDriver$ and AutoUnattend.xml, and BootCamp folder on the Root of a USB, and modified a Windows7 Installation disk and placed on the root as well) The drivers do not load. Have also placed on a brand new USB2, and USB3 flash drive formatted at FAT32, to see if that made a difference, which it did not. The BootCamp USB made within Mac, it loads saying "Now booting into Boot Camp Assistant Created USB Drive..." or something like that (Don't remember the exact Message)
Side Note:
Restored Fusion Drive to its original State, and booted from the BootCamp USB drive, still no usb Mouse & Keyboard Support.

I have same issue
Tried everything differend hdd,ssd as well
Basically when trying instal win 7 via iOS maverick when reboting and windows booting to the first scree everything freezing cant do much.
Also tried install clear ssd without any system, but soon after format ssd or hdd I have error that I cant use this disk to install windows!!!!!!!!!!!!!!!!!
What is funny Windows 8 installing without any problem!!!
what is going on APPLE??wher is support
This issue I have only on Late 2013 on my other Late 2012 this issue not exist and everything working as should.

Cannot install Win 8 on a late 2013 iMac using bootcamp on 10.9

I'm trying to install Win 8 on a late 2013 iMac (purchased a couple of months ago)
I have a win 8 pro DVD, but obviously there is no DVD in this iMac. I usally use the DVD drive in my older 2009 iMac for any disk based installs but I can't appear to use it here.
I followed the instructions and downloaded a Win 8 Pro ISO from Microsoft to use with my authentication code, created a bootable USB using bootcamp, created the partition and rebooted. Once I'd entered the code I get to the install location but it says I cannot install on the partition created by bootcamp. Even if I format the partition it says I need a GPT drive but I have MBR, so won't let me install.
I tried several suggestions including creating aprtitions in various other programs and once I even got past that screen, but as soon as it tried to install I got another error saying the MBR was formatted incorrectly and it failed.
I had no issues installing Win 7 via bootcamp on the older iMac, but this one has me stumped. I used to think I knew a bit about computers, but I'm fairly new to Mac related issues as the older iMac has always just worked.
Any help would be greatly appreciated.

Hello,
I just installed Windows 8.1 on my Late 2013.
There are just a couple of things I had to do that deviated from the Boot Camp Installation Manual.
1. I downloaded my copy of Windows 8.1 as an ISO image AND as a bootable USB from the Microsoft site.
Not sure why I did that but it came in handy because Bootcamp was taking a very long time to copy the ISO onto the USB stick..
The ISO copying seemed to freeze up, but it's likely that it was just taking a long time, probably 20mins.
So, instead of waiting, I took the contents of the the USB startup stick and simply moved them over to the stick that Bootcamp had formatted for the ISO copy (I cancelled that copy function and deleted any files that had copied but didnt complete).
Once that was done, the machine rebooted from the USB stick and began the normal Windows setup process.
All went very smoothly except that my mouse was not working.
2. To get around the mouse issue, I simply plugged in a MS USB Mouse and it worked immediately.
The Bootcamp manual advised that the way around this was to 'click in upper right corner and search for Bootcamp'. Problem was, it was nowhere to be found.
So, using my MS mouse, I navigated to the 'DESKTOP' icon in Win 8.1 and found File Explorer, which showed my USB stick connected along with Bootcamp and the MS Support File (i.e. All the Apple Drivers).
I began manually clicking on all the driver files until realizing that there IS a Bootcamp executable which will automatically install the drivers for the Nvidia card, keyboard, camera, mouse, etc....
Once that was done, my installation was completed.
The entire process took about an hour, but now that I've done it, it really shouldnt take much more than 45 mins.
I have the late 2013 iMAC, with the GTX780M and 1TB Fusion Drive i5 Quad Core.
For those who are leery about doing this, please note that I'm a PC 'lifer' and this is my very first go-around with doing anything on an Apple product.
It all went much more smoothly than I could have imagined, but if you are not a PC person, you might be a little challenged finding the Bootcamp in File Explorer or doing anything in Win 8.1 to get over these minor hurdles.
Good luck!
I'm looking forward to getting STEAM up and running to see how this thing games!

More frequent Kernel Panics on late 2013 iMac

For the last couple of weeks I have been experiencing random iMac restarts with the kernel panic message (http://core0.staticworld.net/images/article/2013/02/kernel-panic-pre-ml_300-1000 24407-medium.png). I have not installed anything suspicious, I have verified the HDD, everything is ok, done the hardware test after a restart (the D button) with no issues found and when I go to the Library, Logs there is no kernel panic report nor any other information on the issue. It seems as the aforementioned message just appears, the iMac restarts and comes back to normal without any additional problems/problem information.
I have late 2013 iMac with os 10.10, everything up to date and fabric Ram memory with a lot of free space on the HDD.
I would really appreciate if someone could give me some pointers or let me know what this could be. Thanks a lot!

Here it is:
Anonymous UUID:       C031B16F-4CEA-99A0-BCFF-4172A022A598
Fri Oct 24 22:52:20 2014
*** Panic Report ***
panic(cpu 2 caller 0xffffff800b41e80a): Kernel trap at 0xffffff7f8d1f80e8, type 13=general protection, registers:
CR0: 0x0000000080010033, CR2: 0x0000000166b9b000, CR3: 0x000000024205503a, CR4: 0x00000000001626e0
RAX: 0xffffff801e813c00, RBX: 0xffffff801e813c00, RCX: 0x0000000000000000, RDX: 0x7fffffffffffffff
RSP: 0xffffff8115763cd0, RBP: 0xffffff8115763cf0, RSI: 0xffffff801e813c00, RDI: 0xffffff801e10ba08
R8: 0x00000000000019e4, R9: 0xffffff800fc68148, R10: 0x0000000000000000, R11: 0x000000000000063c
R12: 0x1000000000000000, R13: 0x0000000000000003, R14: 0xffffff801e10ba08, R15: 0xffffff802cd55000
RFL: 0x0000000000010206, RIP: 0xffffff7f8d1f80e8, CS: 0x0000000000000008, SS: 0x0000000000000010
Fault CR2: 0x0000000166b9b000, Error code: 0x0000000000000000, Fault CPU: 0x2
Backtrace (CPU 2), Frame : Return Address
0xffffff810dee5e10 : 0xffffff800b33a811
0xffffff810dee5e90 : 0xffffff800b41e80a
0xffffff810dee6050 : 0xffffff800b43a443
0xffffff810dee6070 : 0xffffff7f8d1f80e8
0xffffff8115763cf0 : 0xffffff7f8d1f99b2
0xffffff8115763d20 : 0xffffff7f8d2041f1
0xffffff8115763d50 : 0xffffff7f8d29f940
0xffffff8115763d80 : 0xffffff7f8d202990
0xffffff8115763db0 : 0xffffff7f8d202a05
0xffffff8115763dd0 : 0xffffff800b8ff2eb
0xffffff8115763df0 : 0xffffff800b3ee455
0xffffff8115763e10 : 0xffffff800b33e91c
0xffffff8115763e40 : 0xffffff800b3235a3
0xffffff8115763e90 : 0xffffff800b333e8d
0xffffff8115763f10 : 0xffffff800b40a142
0xffffff8115763fb0 : 0xffffff800b43ac66
      Kernel Extensions in backtrace:
         com.apple.iokit.IOAcceleratorFamily2(156.4)[20DDCE61-E3EC-3CC1-8B79-170CEF2B603 A]@0xffffff7f8d1e3000->0xffffff7f8d24ffff
            dependency: com.apple.iokit.IOPCIFamily(2.9)[766FC23F-452C-3B74-951C-598BB17BCF06]@0xffffff 7f8bb24000
            dependency: com.apple.iokit.IOGraphicsFamily(2.4.1)[6D99A3BE-D531-3780-880B-13F2FC894A4A]@0 xffffff7f8bdec000
         com.apple.GeForce(10.0)[26D2EC64-4AF8-32C8-BF74-5B1E80772FAA]@0xffffff7f8d25e00 0->0xffffff7f8d2f3fff
            dependency: com.apple.iokit.IOPCIFamily(2.9)[766FC23F-452C-3B74-951C-598BB17BCF06]@0xffffff 7f8bb24000
            dependency: com.apple.iokit.IONDRVSupport(2.4.1)[F4738C55-B507-3627-A9CA-3D29A5230A03]@0xff ffff7f8be33000
            dependency: com.apple.nvidia.driver.NVDAResman(10.0.0)[53CC0E05-7382-336C-8239-AE884D6CA71A ]@0xffffff7f8be49000
            dependency: com.apple.iokit.IOGraphicsFamily(2.4.1)[6D99A3BE-D531-3780-880B-13F2FC894A4A]@0 xffffff7f8bdec000
            dependency: com.apple.iokit.IOAcceleratorFamily2(156.4)[20DDCE61-E3EC-3CC1-8B79-170CEF2B603 A]@0xffffff7f8d1e3000
BSD process name corresponding to current thread: WindowServer
Mac OS version:
14A389
Kernel version:
Darwin Kernel Version 14.0.0: Fri Sep 19 00:26:44 PDT 2014; root:xnu-2782.1.97~2/RELEASE_X86_64
Kernel UUID: 89E10306-BC78-3A3B-955C-7C4922577E61
Kernel slide:     0x000000000b000000
Kernel text base: 0xffffff800b200000
__HIB text base: 0xffffff800b100000
System model name: iMac14,2 (Mac-27ADBB7B4CEE8E61)
System uptime in nanoseconds: 29948396975274
last loaded kext at 15673659043007: com.apple.filesystems.msdosfs 1.10 (addr 0xffffff7f8dd7d000, size 69632)
last unloaded kext at 17607432106459: com.apple.iokit.IOSCSIBlockCommandsDevice 3.7.0 (addr 0xffffff7f8dd69000, size 81920)
loaded kexts:
com.apple.driver.AudioAUUC 1.70
com.apple.driver.AppleHWSensor 1.9.5d0
com.apple.driver.AGPM 100.14.37
com.apple.driver.ApplePlatformEnabler 2.1.0d1
com.apple.driver.X86PlatformShim 1.0.0
com.apple.filesystems.autofs 3.0
com.apple.driver.AppleBluetoothMultitouch 85.3
com.apple.iokit.IOBluetoothSerialManager 4.3.0f10
com.apple.driver.AppleMikeyHIDDriver 124
com.apple.driver.AppleOSXWatchdog 1
com.apple.driver.AppleHDA 266.5
com.apple.driver.AppleMikeyDriver 266.5
com.apple.iokit.IOUserEthernet 1.0.1
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AppleUpstreamUserClient 3.6.1
com.apple.driver.AppleThunderboltIP 2.0.2
com.apple.driver.AppleBacklight 170.4.12
com.apple.driver.AppleHWAccess 1
com.apple.driver.AppleIntelHD5000Graphics 10.0.0
com.apple.driver.AppleHV 1
com.apple.driver.AppleLPC 1.7.3
com.apple.GeForce 10.0.0
com.apple.driver.AppleMCCSControl 1.2.10
com.apple.driver.AppleIntelFramebufferAzul 10.0.0
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.3.0f10
com.apple.driver.AppleSMCLMU 2.0.4d1
com.apple.iokit.SCSITaskUserClient 3.7.0
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.BootCache 35
com.apple.driver.AppleUSBHub 705.4.1
com.apple.driver.XsanFilter 404
com.apple.iokit.IOAHCIBlockStorage 2.6.5
com.apple.driver.AppleSDXC 1.6.5
com.apple.iokit.AppleBCM5701Ethernet 10.1.2b3
com.apple.driver.AirPort.Brcm4360 900.19.8
com.apple.driver.AppleAHCIPort 3.0.7
com.apple.driver.AppleUSBXHCI 705.4.14
com.apple.driver.AppleRTC 2.0
com.apple.driver.AppleACPIButtons 3.1
com.apple.driver.AppleHPET 1.8
com.apple.driver.AppleSMBIOS 2.1
com.apple.driver.AppleACPIEC 3.1
com.apple.driver.AppleAPIC 1.7
com.apple.nke.applicationfirewall 161
com.apple.security.quarantine 3
com.apple.security.TMSafetyNet 8
com.apple.driver.AppleBluetoothHIDKeyboard 175.5
com.apple.driver.AppleHIDKeyboard 175.5
com.apple.kext.triggers 1.0
com.apple.driver.IOBluetoothHIDDriver 4.3.0f10
com.apple.driver.AppleMultitouchDriver 260.30
com.apple.iokit.IOSerialFamily 11
com.apple.driver.DspFuncLib 266.5
com.apple.kext.OSvKernDSPLib 1.15
com.apple.iokit.IOAudioFamily 200.6
com.apple.vecLib.kext 1.2.0
com.apple.driver.AppleBacklightExpert 1.1.0
com.apple.driver.X86PlatformPlugin 1.0.0
com.apple.iokit.IOSurface 97
com.apple.driver.IOPlatformPluginFamily 5.8.0d49
com.apple.driver.AppleThunderboltEDMSink 4.0.2
com.apple.iokit.IOAcceleratorFamily2 156.4
com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.3.0f10
com.apple.iokit.IOBluetoothFamily 4.3.0f10
com.apple.iokit.IOUSBUserClient 705.4.0
com.apple.driver.AppleSMC 3.1.9
com.apple.nvidia.driver.NVDAGK100Hal 10.0.0
com.apple.nvidia.driver.NVDAResman 10.0.0
com.apple.AppleGraphicsDeviceControl 3.7.21
com.apple.driver.AppleSMBusController 1.0.13d1
com.apple.driver.AppleHDAController 266.5
com.apple.iokit.IOHDAFamily 266.5
com.apple.driver.AppleSMBusPCI 1.0.12d1
com.apple.iokit.IONDRVSupport 2.4.1
com.apple.iokit.IOGraphicsFamily 2.4.1
com.apple.driver.AppleUSBMergeNub 705.4.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.7.0
com.apple.iokit.IOBDStorageFamily 1.7
com.apple.iokit.IODVDStorageFamily 1.7.1
com.apple.iokit.IOCDStorageFamily 1.7.1
com.apple.iokit.IOUSBMassStorageClass 3.7.0
com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.0
com.apple.driver.AppleUSBComposite 705.4.9
com.apple.driver.AppleThunderboltDPInAdapter 4.0.6
com.apple.driver.AppleThunderboltDPOutAdapter 4.0.6
com.apple.driver.AppleThunderboltDPAdapterFamily 4.0.6
com.apple.driver.AppleThunderboltPCIDownAdapter 2.0.2
com.apple.driver.AppleThunderboltNHI 3.1.7
com.apple.iokit.IOThunderboltFamily 4.2.1
com.apple.iokit.IOEthernetAVBController 1.0.3b3
com.apple.iokit.IO80211Family 700.52
com.apple.driver.mDNSOffloadUserClient 1.0.1b8
com.apple.iokit.IONetworkingFamily 3.2
com.apple.iokit.IOAHCIFamily 2.7.0
com.apple.iokit.IOUSBFamily 705.4.14
com.apple.driver.AppleEFINVRAM 2.0
com.apple.driver.AppleEFIRuntime 2.0
com.apple.iokit.IOHIDFamily 2.0.0
com.apple.iokit.IOSMBusFamily 1.1
com.apple.security.sandbox 300.0
com.apple.kext.AppleMatch 1.0.0d1
com.apple.driver.AppleKeyStore 2
com.apple.driver.AppleMobileFileIntegrity 1.0.5
com.apple.driver.AppleCredentialManager 1.0
com.apple.driver.DiskImages 389.1
com.apple.iokit.IOStorageFamily 2.0
com.apple.iokit.IOReportFamily 31
com.apple.driver.AppleFDEKeyStore 28.30
com.apple.driver.AppleACPIPlatform 3.1
com.apple.iokit.IOPCIFamily 2.9
com.apple.iokit.IOACPIFamily 1.4
com.apple.kec.corecrypto 1.0
com.apple.kec.Libm 1
com.apple.kec.pthread 1
System Profile:
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x111), Broadcom BCM43xx 1.0 (7.15.124.12.8)
Bluetooth: Version 4.3.0f10 14890, 3 services, 27 devices, 1 incoming serial ports
Thunderbolt Bus: iMac, Apple Inc., 23.10
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1600 MHz, 0x802C, 0x384B54463531323634485A2D314736453220
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1600 MHz, 0x802C, 0x384B54463531323634485A2D314736453220
USB Device: BRCM20702 Hub
USB Device: Bluetooth USB Host Controller
USB Device: FaceTime HD Camera (Built-in)
USB Device: MT1836
USB Device: USB 2.0 Hub
Serial ATA Device: APPLE HDD ST1000DM003, 1 TB
Model: iMac14,2, BootROM IM142.0118.B07, 4 processors, Intel Core i5, 3.2 GHz, 8 GB, SMC 2.15f7
Network Service: Wi-Fi, AirPort, en1
Graphics: NVIDIA GeForce GT 755M, NVIDIA GeForce GT 755M, PCIe, 1024 MB

New late 2013 iMac running slow

I purchased a new 21 in iMac in Dec 2013 (late 2013 model), and ever since, its been running very slow. Its slowness is mostly erratic and random, however very noticeable while running Office for Mac documents (Word & Excel), it takes anything from 30 sec - 1 min just to launch these apps. And equally slow while running Aperture (I am a photographer and this is my primary app). I usually end up restarting the iMac several times a day in the hope that it'll speed up. Every one who has seen me work on it has laughed that its slower than most ancient Windows machines.
Over the past few months, with support from Apple customer service, I have reformatted, re-partitioned and reinstalled Maverics on the iMac (and my MBP, which has the same issues), and done everything else that apple normally recommends as routine procedure, but no improvement in performance. The Apple support person has now stopped responding to my calls or emails.
What could be possible issues?
In my system preferences pane, there is 'Flash player' and 'Java' in the non-system apps installed. I guess we cant do without either of these.
Could there be a problem with my data? The data on my iMac is the same as on my MBP, as I transfered it via TimeMachine when i purchased the iMac.

hi Here is the report from EtreCheck generated on my iMac. Any suggestions on what the issue could be and how to resolve it are welcome. There is 200+ GB free space on the 1TB drive.
EtreCheck version: 1.9.11 (43) - report generated 4 June 2014 1:55:59 pm IST
Hardware Information:
          iMac (21.5-inch, Late 2013)
          iMac - model: iMac14,3
          1 2.9 GHz Intel Core i5 CPU: 4 cores
          8 GB RAM
Video Information:
          NVIDIA GeForce GT 750M - VRAM: 1024 MB
System Software:
          OS X 10.9.3 (13D65) - Uptime: 0 days 0:55:33
Disk Information:
          APPLE HDD HTS541010A9E662 disk0 : (1 TB)
                    EFI (disk0s1) <not mounted>: 209.7 MB
                    Macintosh HD (disk0s2) / [Startup]: 999.35 GB (215.83 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
USB Information:
          Apple Inc. BRCM20702 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Apple Inc. FaceTime HD Camera (Built-in)
          Apple Inc. MacBook Air SuperDrive
Thunderbolt Information:
          Apple Inc. thunderbolt_bus
Gatekeeper:
          Anywhere
Launch Daemons:
          [loaded] com.adobe.fpsaud.plist Support
          [loaded] com.adobe.SwitchBoard.plist Support
          [loaded] com.microsoft.office.licensing.helper.plist Support
          [loaded] com.oracle.java.Helper-Tool.plist Support
Launch Agents:
          [not loaded] com.adobe.AAM.Updater-1.0.plist Support
          [loaded] com.adobe.CS5ServiceManager.plist Support
          [loaded] com.oracle.java.Java-Updater.plist Support
User Launch Agents:
          [loaded] com.adobe.ARM.[...].plist Support
          [running] com.genieo.completer.download.plist Support
          [loaded] com.genieo.completer.update.plist Support
          [running] com.vladalexa.MagicPrefs.plist Support
User Login Items:
          None
Internet Plug-ins:
          AdobeAAMDetect: Version: AdobeAAMDetect 1.0.0.0 - SDK 10.6 Support
          FlashPlayer-10.6: Version: 13.0.0.214 - SDK 10.6 Support
          Default Browser: Version: 537 - SDK 10.9
          AdobePDFViewerNPAPI: Version: 11.0.07 - SDK 10.6 Support
          AdobePDFViewer: Version: 11.0.07 - SDK 10.6 Support
          Flash Player: Version: 13.0.0.214 - SDK 10.6 Support
          QuickTime Plugin: Version: 7.7.3
          SharePointBrowserPlugin: Version: 14.0.0 Support
          JavaAppletPlugin: Version: Java 7 Update 55 Check version
Safari Extensions:
          codec-M: Version: 1.0.0.1
          Evernote Web Clipper: Version: 5.9.15
          GoPhoto.it: Version: 1.10
          Omnibar: Version: 1.2
Audio Plug-ins:
          BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
          AirPlay: Version: 2.0 - SDK 10.9
          AppleAVBAudio: Version: 203.2 - SDK 10.9
          iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins:
          Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
User Internet Plug-ins:
          CitrixOnlineWebDeploymentPlugin: Version: 1.0.105 Support
          Google Earth Web Plug-in: Version: 6.0 Support
3rd Party Preference Panes:
          CleanApp Logging Service Support
          Flash Player Support
          Java Support
          MagicPrefs Support
Time Machine:
          Mobile backups: OFF
          Auto backup: NO - Auto backup turned off
          Volumes being backed up:
                    Macintosh HD: Disk size: 930.71 GB Disk used: 729.70 GB
          Destinations:
                    Bhaven's 3TB [Local] (Last used)
                    Total size: 3
                    Total number of backups: 12
                    Oldest backup: 2013-12-02 22:51:14 +0000
                    Last backup: 2014-04-26 20:48:37 +0000
                    Size of backup disk: Excellent
                              Backup size 3 > (Disk size 930.71 GB X 3)
          Time Machine details may not be accurate.
          All volumes being backed up may not be listed.
Top Processes by CPU:
               1%          WindowServer
               1%          PluginProcess
               1%          fontd
               0%          System Events
               0%          imagent
Top Processes by Memory:
          180 MB          WindowServer
          139 MB          com.apple.WebKit.WebContent
          123 MB          PluginProcess
          106 MB          mds_stores
          82 MB          com.apple.IconServicesAgent
Virtual Memory Information:
          5.50 GB          Free RAM
          1.43 GB          Active RAM
          274 MB          Inactive RAM
          819 MB          Wired RAM
          365 MB          Page-ins
          0 B          Page-outs

Repair Windows 7 on a 2013 iMac with USB 3 issue

Hi. I have a corrupt Windows 7 parition on my late 2013 iMac that Disk Utility can not seem to repair. My best guess is a the 'Repair Windows' from the install disc upon booting up will fix the issue. The problem is....my 2013 iMac only has USB 3 ports available and from what I am reading it appears Windows 7 does not support USB 3. Therefore....my external CD drive is not being seen, nor are my keyboard, mouse, or anything else via the USB 3 ports (I also tried a bootable flash drive with the neccesary Windows files on there). I even went as far as making a bootable SD Card and trying to repair from that, but I still can not utilize my mouse and keyboard to advance through the prompts.
I did not have these issues when I installed it using Bootcamp because I am guessing bootcamp supplies the neccesary means to allow the USB 3 ports to be recognized. But Bootcamp does not have a feature for repairing windows. It is only giving me the option to remove Windows.
Is there anyway I can repair windows using my Windows installation CD on an iMac by means of using USB 3 ports?
Thanks in advance.

For attempting to repair a Windows 7 partition you need to be able to boot into Windows setup indeed. The complication is that Windows 7 installer has aged and does not support the relatively new USB 3 standard.
I can only this of one approach which is by downloading the available Windows ISO and use USB instead of your DVD. It is kind of a long shot and does have its risks, but I'll describe it high-level nonetheless:
- Using Boot Camp create an USB with Windows 7 edition you run as well as the appropriate Windows Support Files from Apple
- From OS X or the Mac's Recovery Console you could shrink your HFS+ partition for about 3 GB to create some free space
- Insert an additional primary partition in this free space and format it FAT
- Sync this GPT change to MBR manually using fdisk and reboot into OS X
- Pre-copy the Windows PE driver folder onto this new FAT partition to overcome the USB 3 issue
- Reboot in legacy bless'd mode to your USB recovery stick
The Windows setup screen should display an option to repair instead of install... Your mileage could vary depending on the type of corruption(!)

USB Audio Problems Late 2013 iMac - Clicking / Popping / Dropouts

I am having audio clicking and popping issues with a brand new late model 2013 iMac and a USB 2.0 multi-channel audio recording interface. Here is what I have learned so far:
Clicking and popping is occurring in both directions - playback and recording. I am not having any issues with internal audio, so this was easy to verify.
The same issue appears in many threads in Apple Support Communities and in various recording/pro audio forums, so this seems to be a common issue.
The issue is independent of the audio interface that is used. (I am using a brand new Focusrite Scarlett 18i20 that I purchased specifically to use with my new iMac, but the forums report the same issues for a variety of other interfaces and audio devices.)
Five potential root causes are mentioned in the various forums:
1) USB 3.0 compatibility issues - poor backward compatibility or other issues
2) Fusion Drive activity - artifacts caused by drive "swapping"
3) OS X version - newer versions may be worse than old versions
4) App Nap - ?
5) Driver issues
Potential short-term solutions include:
1) Change driver - The "Class Compliant Mode" app (that I downloaded from the link on the Focusrite website) improved the issue for me, but clicking and popping occurs every few seconds instead of constantly.
2) Exchange the Fusion Drive for a conventional 7200 RMP hard drive - Forums report that this does not fix the issue.
3) Install older version of OS - Forums report that this does not fix the issue.
4) Disable App Nap - Forums report that this does not fix the issue.
5) Belkin Thunderbolt express dock - Forums report that a Thunderbolt hub with USB gives excellent results, but the only one I am aware of is the Belkin one which is ~$300. (I will not pay $300 to fix thousands of dollars of new equipment that should not need to be fixed!!!)
6) Apple Care's advice was an SMC reset (essentially a reboot), which clearly did not work. The person that I talked to was not aware of this being a known issue.
I am at a point where I need to decide whether or not to get a refund for this iMac since my primary reason for getting this new computer was recording. So...can anyone help to answer these questions:
Has Apple acknowleged this issue? If so, has Apple committed to fixing this issue via a software upgrade or have they admitted that this is a hardware limitation that is not fixable?
Has anyone found a free or inexpensive workaround (i.e. not the $300 Belkin dock) that completely elimiates this issue?

I'm also having audio issues on my new late 2013 iMac via the USB headset. Audio starts playing fine and then static starts creeping into the audio until it drowns out the sound. Only way to fix is to unplug the headset and then plug it back into the USB port.
I've tested the headset on other PCs and my older iMac and the issue doesn't show up.
I've re-installed Mavericks on the iMac, without nuking my data, but that still doesn't solve the issue.
I've logged a case with Apple support and they had me run a program which gathered up a bunch of information to send to their engineering team. No updates yet so far.
Just one question for those that also have this issue. Did you restore your data from a Time Machine backup, or is this issue also happening on the Mac that's fresh out of the box?
I'm wondering if this issue could be caused by restoring data from my Time Machine, but I don't want to go through the hassle of nuking my entier hard drive and having to reinstall everything from scratch just to fix this issue.

Graphics related crashes since Yosemite on a 27' late 2013 iMac

Hello all,
My 27 inch late 2013 iMac with a NVIDIA GeForce GTX 775M 2048 MB started freezing or auto-rebooting since I updated to Yosemite.
Crashes would occur randomly and were sometimes accompanied by lots of red boxes on the screen.
These kind of crashes seem to have stopped happening but now shifted to almost everytime I fire up Launchpad or Expose (and once when I opened the notifcation center). The screen freezes for a couple of seconds and the system will reboot, prompting me with a graphics related error.
Because my searches on this issue come up empty I would like to ask if anyone can tell me whether or not this is a bug or a hardware related problem.
Thanks for any help
Maybe related: My iMac sometimes takes a more than usual amount of seconds to wake from sleep. The screen will turn on but remain black.

Try these in order testing your system after each to see if it's back to normal:
1. a. Resetting your Mac's PRAM and NVRAM
    b. Intel-based Macs: Resetting the System Management Controller (SMC)
2. Restart the computer in Safe Mode, then restart again, normally. If this doesn't help, then:
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the Utilities menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
3. Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the Utilities menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu. Select Restart from the Apple menu.
4. Reinstall Yosemite: Reboot from the Recovery HD. Select Reinstall OS X from the Utilities menu, and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.
5. Reinstall Yosemite from Scratch:
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
How to Clean Install OS X Yosemite
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.

Late 2013 iMac and image retention issues

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