IMac is stuck on apple logo and spinning wheel stop spinning

Hello everyone, I have iMac 9,1, somehow i lost my OS X partition and i left with just a Windows. So now i tried to clean install new OS X Yorshmite, i boot a new installation and a apple logo is spinning and after 2 minutes it stuck and usb driver stop reading, 5 minutes after iMac just shut down and that's it. I can't access recovery mode.
I tried with replacing old with new Hard Drive, removing RAMs, diferent versions of OS X and still nothing. A can't boot in SAFE MODE or Recovery Mode.
Windows 7 working fine and i can boot it without problems.
Please help?

Startup - Gray, Blue or White screen at boot, w/spinner/progress bar
Startup - Gray Screen
Startup Issues - Resolve
Startup Issues - Resolve (2)

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IMac is stuck on apple logo and spinning wheel

My wife did a software update and them it asked for a restart, she click restart but the computer got stuck in apple logo and spinning wheel. Won't go past that now. Just keeps spinning! Help for I know not what to do!!!! Please any idea?

An invalid node is an error DU cannot repair. If you don't mind spending $100 for Disk Warrior, then I suggest you buy it because it can fix the error. Otherwise, do as the warning says. Backup your files. You will then have to erase the drive and reinstall. The procedure is:
Install or Reinstall Lion/Mountain Lion 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.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the 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.
Erase the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your startup volume (usually Macintosh HD) from the
      left side list. Click on the Erase tab in the DU main window.
3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
        the Security button and set the Zero Data option to one-pass. Click on
      the Erase button and wait until the process has completed.
4. Quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.

Macbook Pro Stuck at Apple Logo and Spinning Wheel

I Have ML. Just did the most recent update. There seemed to be a bundled group of updates. Once all was updated, my computer froze. I shutdown and restarted and it was stuck on the Apple Logo and spinning wheel. I have tried everything. Safe Mode, Command R, Command/Alt/R/P....it does nothing. Any advice out there?

Reinstalling Lion/Mountain Lion Without Erasing the Drive
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the 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.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main 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.
Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion 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.

Please help me! MacBook Pro stuck on apple logo and spinning wheel

Hi I'm really desperate and need help! My MacBook just stopped loading and would stay on the gray screen with the apple logo and spinning wheel.
I have tried safe mode and it would load a little and stop and then the loading bar would be blank and it would stay like that forever!!
I also have tried doing the single user mode and when I type the fsck - fy it will do a couple more lines then it will say error like a hundred times :(
I did verbose mode and it would just give me stuff that I have no idea what it saying I left on verbose mode for like 5 hours and it would just give me lines of stuff I have no idea what it's saying!
I downloaded lion through apple store so I don't have the disk I only have my snow leopard disk
Please please someone tell me a solution it's my moms laptop and I don't want to get in trouble!

Reboot in recovery mode an possibly repair over the internet.
Command-R to the rescue.
Just hold down Command-R during startup and OS X Recovery springs into action. It lets you choose from common utilities: You can run Disk Utility to check or repair your hard drive, erase your hard drive and reinstall a fresh copy of OS X, or restore your Mac from a Time Machine backup. You can even use Safari to get help from Apple Support online. And if OS X Recovery encounters problems, it will automatically connect to Apple over the Internet.
http://support.apple.com/kb/HT4718

MacBook that will not reboot- stuck on apple logo and spinning gear

Hello I have a MacBook that will not reboot. It gets to the gray screen with the apple logo and the spinning gear and that's it. I have tried restarting the PRAM, performing safe boot, and verbose method. What can I do to get my Mac back? please help

Try holding the power button for about 10 seconds and try powering it on again. If all else fails, bring it in for servicing.
- Dominic

Mac won't boot: stuck on apple logo and spinning wheel

My MacBook pro 13 inch(mid 2010) won't boot. It just gets stuck on the apple logo with the spinning wheel under it. I have done the following but they have not solved the issue:
Zap pram
Attempt to boot in safe mode
Try to access windows partition( resulted in flashing folder with question mark)
I am dying to try to insert the Mac os x install disc and use disk utility, but it is not going into the drive. This all started when I had to turn off my Mac because it had completely froze. Any help would be greatly appreciated, especially if there is a way to insert the install disk.
Thanks in advance for any assistance.

Try this:
Booting From An OS X Installer Disc
1. Insert OS X Installer Disc into the optical drive.
2. Restart the computer.
3. Immediately after the chime press and hold down the "C" key.
4. Release the key when the spinning gear below the dark gray Apple logo appears.
5. Wait for installer to finish loading.
If you have a problem with the above, then try:
1. Restart the computer.
2. Immediately after the chime press and hold down the "OPTION" key.
3. Wait for the boot manager screen to appear, then insert the installer disc into the optical drive.
4. Wait until the disc is recognized and appears in the boot manager screen.
5. After the disc appears select it then click on the downward pointing arrow button.
5. Wait for installer to finish loading.
If you are running Snow Leopard, then reinstall it. Your HDD will not be erased, and all your data will be preserved.
If you are running Leopard then do this:
How to Perform an Archive and Install
An Archive and Install will NOT erase your hard drive, but you must have sufficient free space for a second OS X installation which could be from 3-9 GBs depending upon the version of OS X and selected installation options. The free space requirement is over and above normal free space requirements which should be at least 6-10 GBs. Read all the linked references carefully before proceeding.
1. Be sure to use Disk Utility first to repair the disk before performing the Archive and Install.
Repairing the Hard Drive and Permissions
Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger, Leopard or Snow Leopard.) 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 installer. Now restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Do not proceed with an Archive and Install if DU reports errors it cannot fix. In that case use Disk Warrior and/or TechTool Pro to repair the hard drive. If neither can repair the drive, then you will have to erase the drive and reinstall from scratch.
3. Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When you reach the screen to select a destination drive click once on the destination drive then click on the Option button. Select the Archive and Install option. You have an option to preserve users and network preferences. Only select this option if you are sure you have no corrupted files in your user accounts. Otherwise leave this option unchecked. Click on the OK button and continue with the OS X Installation.
4. Upon completion of the Archive and Install you will have a Previous System Folder in the root directory. You should retain the PSF until you are sure you do not need to manually transfer any items from the PSF to your newly installed system.
5. After moving any items you want to keep from the PSF you should delete it. You can back it up if you prefer, but you must delete it from the hard drive.
6. You can now download a Combo Updater directly from Apple's download site to update your new system to the desired version as well as install any security or other updates. You can also do this using Software Update.

Macbook Air stuck on Apple Logo and spinning wheel

I have no clue what is going on. I turned on my macbook and it was like this, I thought it just needed some time loading but after 20 minutes I decided to look for ways to fix this. I tried holding the shift key right after I restarted it but the loading bar disappeared when it hit halfway.
What can I do?
I don't have the lion nor the snow leopard. but I do update when my mac tells me to.
Other info, I haven't used my macbook air for approx 3 weeks but it was all ok the last time I saw it. I dunno if that helps you help me with this.

To clone the drive you need to boot from the USB stick. After the installer loads click on your language then click on the Continue button. After the menubar appears select Disk Utility from the Utility menu.
Clone using Restore Option of Disk Utility
Select the destination volume from the left side list.
Click on the Restore tab in the DU main window.
Check the box labeled Erase destination.
Select the destination volume from the left side list and drag it to the Destination entry field.
Select the source volume from the left side list and drag it to the Source entry field.
Double-check you got it right, then click on the Restore button.
Destination means the external backup drive. Source means the internal startup drive.
If you are not able to clone the drive this way then most likely the drive's directory is corrupted.

I did an auto software update on my iMac, which included a restart. When the machine restarted it's stuck with an Apple logo and spinning wheel. I've tried all of the key strokes that are supposed to work, but nothing has. Any suggestions? Thanks!

I did an auto software update on my iMac, which included a restart. When the machine restarted it's stuck with an Apple logo and spinning wheel. I've tried all of the key strokes that are supposed to work, but nothing has. Any suggestions?

Gray screen could be any number of things, bad third party at boot kext file, a bad Apple one, a bad install/upgrade of OS X, drive corruption etc.
Run through this list of fixes
Step by Step to fix your Mac

My Imac won't boot up. It is stuck on apple logo with spinning gear.

My Imac won't boot up. It is stuck on apple logo with spinning gear. It will not boot in safe mode, my install disc will not read and fsck wont fix it.. I can hear the hard drive spinning. So i know my drive is not bad.. Right before this happened i was low on space so i deleted a bunch of movies but for some reason i had to change my drive permissions to do so..

Is your data backed up? If not, see these means of data recovery: https://discussions.apple.com/docs/DOC-1689 If it is backed up, then purchase Alsoft Disk Warrior. Boot it using the Option key of a wired Apple keyboard.

Start up screen stuck on grey screen with apple logo and spinning gear

Start up screen is stuck on grey screen with apple logo and spinning gear. What should I do?

See this thread with dominic23’s suggestions: https://discussions.apple.com/thread/5783326?tstart=0

I cannot start my mac book. Apple logo and spinning wheel on gray screen. Tried pressing shift key on start up nothing happen. Tried shift command V screen is still stuck

I cannot start my mac book. Apple logo and spinning wheel on gray screen. Tried pressing shift key on start up nothing happen. Tried shift+command+V screen is still stuck

Reinstall OS X without erasing the drive
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. 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 installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install Mac OS X 10.6.8 Update Combo v1.1.
=======================================
Reinstall - Mavericks, Lion/Mountain Lion
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the 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.
Repair
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 then click on the Repair Permissions button. When the process is completed, then quit DU and return to the main menu. Select Restart from the Apple menu.
Reinstall Mountain Lion or Mavericks
OS X Mavericks- Reinstall OS X
OS X Mountain Lion- Reinstall OS X
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is
three times faster than wireless.

Gray screen, apple logo and spinning gear hang at start up

after a lengthy round of "bejeweled", i let my imac fall into screen saver mode. when i tried to log back in, i tapped the mouse and the imac flashed as it does when actuated outside a dialogue without clicking the okay button, and immediately returned to screen saver. i then manually shut down and restarted to the gray screen, apple logo and spinning gear hang. i then inserted the leopard install dvd, manually shut down and restarted pressing the option key and selected the install disc. it booted as usual. i selected the language preferred, used the utility drop down menu and selected DU, then selected the hard drive and verify permissions to reveal a pop up "Error: The underlying task reported failure on exit. Permissions verification complete." i immediately selected repair disc, and breathed a sigh of relief with the notification "appears to be ok". then utilities/start up disc/macintosh hd/restart. still get the hang. i have repeated this process several times, also resetting the PRAM as well to the infinite hang. as a matter of fact, the gear has been spinning the entire time creating this post. needless to say, i am truly at a loss. SOS!!!!!!! Please!!!!! SEND LAWYERS, GUNS AND MONEY!!!!

i have perused some of the threads posted per this topic and decided to attempt an "archive and install." i also have a 620gig acomdata external drive with close to a carbon copy of my internal. a few short minutes into the install, the imac reveals a pop up stating it cannot install some files on the hard drive, contact the software manufacturer or restart and try to install again. the internal drive is a 160gig with only about 60gigs of room, so i tried to archive and install to the acomdata instead as it has 180 gig of free space. i get the exact same dialogue once again. restart and a third attempt only archive and install will not highlight, only first time and/or erase and install. further, start up disc shows only the install disc and network as choices. so i attempt first time install on both drives and get the same pop up message again. DU recognizes both drives although verify/repair permissions does not highlight, but not start up disc.
i'm trying not to become frantic, but my patience is threadbare. i am in desperate need of sound advice as to what i need to do.
thanks again in advance,
bradley

Won't turn on white screen with apple logo and spinning disc

Mac book air won't boot up just has a white screen with apple logo and spinning disc have tried all the startup multiple key pushes , I think

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a boot failure is to secure your data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since your last backup, you can skip this step.
There are several ways to back up a Mac that is unable to boot. You need an external hard drive to hold the backup data.
a. Boot into the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.”
b. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
c. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. The easiest way to deal with the problem is to boot from an external drive, or else to use either of the techniques in Steps 1b and 1c to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a boot failure can be resolved by resetting the NVRAM.
Step 4
If you use a wireless keyboard, trackpad, or mouse, replace or recharge the batteries. The battery level shown in the Bluetooth menu item may not be accurate.
Step 5
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 6
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to boot, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can boot now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
Step 7
If you've booted from an external storage device, make sure that your internal boot volume is selected in the Startup Disk pane of System Preferences.
Boot in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you boot in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, your boot volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 6.
If you can boot and log in now, empty the Trash, and then open the Finder Info window on your boot volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then reboot as usual (i.e., not in safe mode.)
If the boot process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 8
Launch Disk Utility in Recovery mode (see Step 1.) Select your startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then reboot as usual.
Step 9
Reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 10
Repeat Step 9, but this time erase the boot volume in Disk Utility before installing. The system should automatically reboot into the Setup Assistant. Follow the prompts to transfer your data from a Time Machine or other backup.
Step 11
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a boot failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 12
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

TS3694 hi i recently updated into ios 7.0.4 now i want to fully restore my ipad to resell but when i restore it it got stuck with apple logo and progress bar with 45% completed as firware file is downloaded using ipad 4 wifi itunes 11.3.8

hi i rescently updated my ipad 4 in ios 7.0.4 and for resell purpose i want to restore my ipad via itunes but it got stuck at apple logo and progress bar of 45% completed i tried it 50 times but it stuck on that exact point for hours i cant able to restore it and had no errors it just like freezes at one point i also uses dfu mode but got stuck at same problem using windows 7 32 bits itunes 11.3.8 ipad 4 wifi please help

My iPhone 5 wouldn't start after I turned it off a few minutes after writing this. It went into recovery mode and I had no choice but to connect to iTunes on PC and restore.
I restored to factory setting first, just to validate my phone was okay. For a second consecutive iOS update, the iPhone 5 did not update smoothly while connected to PC and iTunes - I had to retry two times before the progress bar for the update showed. (The exact same problem with the restart occured when I updated to 7.0.4.)
The good news is that I was ultimately able to restore the iPhone 5 to factory settings while running iOS 7.0.6. I did have a backup from about a month ago lying around and was able to successfully restore with that as well, so the damage done is almost negligible since I had my contacts, notes, mail, etc. backed up to iCloud.
Once I completed both restores, the sync with iTunes worked fine.

Mac Mini won't boot past Apple logo and spinning wheel

Hello,
I have a Mac mini (late 2009) running 10.8.2. Today, I tried to log into the computer. It accepted my username and password, but then the screen turned gray instead of logging in. I left it like that for about twenty minutes, then gave up on waiting and Ctrl-Command-Power rebooted it. It then wouldn't reboot: it gets to the Apple logo and spinning loading wheel, but won't go past there.
So I went into single-user mode and was able to access the HD fine. I ran a filesystems check using the recommended syntax (/sbin/fsck -fy, I think). It said that the volume looked okay, and that it had been modified. I took this as a good sign (that it had been repaired) and typed "reboot" to restart the machine. I held Command-Shift-V to perform a Verbose Safe Boot.
The computer makes no further progress after the following four lines:
vboxdrv: fAsync=0 offMin0x809 offMax=0x2bc3
VBoxDrv: version 3.2.12 r68302; IOCtl version 0x140001; IDC version 0x10000; dev major=34
VBoxFltDrv: version 3.2.12 r68302
VBoxAdpDrv: version 3.2.12 r68302
I'm assuming all the instances of "vbox" are in reference to Oracle's VirtualBox VM. I do have VirtualBox installed, but haven't used it in a while (months), so I don't see why it's suddenly causing a problem.
To clarify, the computer doesn't "hang" after these lines: I can still type text into the terminal. The entire log is being saved to /dev/console, so I could probably grab it from Single-User Mode if necessary.
Everything else seems to be working properly: even the wl0 drivers are loaded.
Does anyone have any suggestions about how to fix this, or at least disable VirtualBox so the computer can start?
Thanks!
WC

Cult of Mac post:
When the Apple Logo appears your Mac has found a valid system disk, and Mac OS X begins loading.
Apple Logo with Spinning Gear
Once the spinning gear appears the BSD kernel (Darwin) has assumed command and begins loading device drivers. Shortly thereafter it transfers command to the almighty (and controversial) launchd process. Such are the workings of UNIX.
What this means for us mortals is that when a Mac stalls at the Apple logo or the logo with a spinning gear, it probably has a corrupt Mac OS X installation. It may also be having trouble accessing an internal or external hardware component, but this is less-likely.
Rebooting your Mac in Safe Mode can sometimes get things working well-enough that a second, normal reboot then works normally Hold down the Shift key at startup to boot in Safe Mode. DiskWarrior is also worth a shot (this is by far my most used disk utility). If that doesn’t work, an Archive & Install may be needed.
Read more at http://www.cultofmac.com/50685/how-to-fix-common-mac-startup-problems-macrx/#CGI mG3jeGEBtysX1.99

IMac is stuck on apple logo and spinning wheel stop spinning

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