IMac gray screen (with frozen "spinning gear") during startup

Hello all - my first post to the community, so be gentle....
I'm having a boot issue with my early 2008 Intel based iMac. After a recent power outage, I can't get the machine to boot to OSX - the spinning gear spins for about a minute then freezes. When I boot to Snow Leopard install CD, it gets to the same point then displays a Kernel Crash screen. I can boot to Windows using the option key on startup, but Windows runds a little weird...mostly graphic display errors (dragging windows and scrolling in web browser is slow and jumpy, games crash with strange graphics displayed). I suspect a graphics card malfunction (the machine has an NVidia GeForce 8800GS), but I'm not convinced and I can't figure out how to test it. Here's more info:
- I'm running OSX version 10.6 with a Boot Camp XP partition.
- I've disconnected all peripherals except keyboard and mouse (including Ethernet)
- I've reset NVRAM/PRAM
- Safe boot, Single-user mode won't boot
- I haven't pulled and reset any RAM modules yet.
Any thoughts would be appreciated - I'm three hours from the nearest Genius Bar, so I'd like to try as much at-home troubleshooting as possible.

http://support.apple.com/kb/TS2570 Mac OS X: Gray screen appears during startup
When I boot to Snow Leopard install CD, it gets to the same point then displays a Kernel Crash screen.
OS X: About kernel panics
User Tip: Kernel Panics? Don't panic too!
How to troubleshoot a kernel panic
I'm running OSX version 10.6
Use Software Update or the OS 10.6.8 combo update to update your OS. Also, update everything SU has to offer for your computer. When done, repair permissions and restart your computer.
I'm three hours from the nearest Genius Bar
Apple Stores are not the only places that repair Macs. There may be an AASP that is closer.
International AASP’s & Other Services
AASP's Outside of the USA
so be gentle....
As opposed to....

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Late 2008 MacBook Pro won't boot; only gray screen with Apple, spinning gear, and then the mouse pointer.

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The encryption never actually followed through.
You started it, though. That makes the volume inaccessible to any OS X version before 10.7.

I mac is snow leopard I bought for 19.99 mountain lion online an my computer has gray screen with the spinning wheel and don't work help me z

My computer I Mac is 10.6.5 I think but the issue was when I update it ask me for version 10.8.5 that was mountain lion wich I bought it for 19.99 Iand know is not working it had a gray screen with spinning wheel I have snow leopard on my iMac I bought mountin lion know the screen I grey I can't do nothing I reboots don't work I inserted the cd for my I Mac don't work can't do nothing I can't remove the cd can someone help me .

To get the CD to eject, hold down the mouse, or if you use it, trackpad, button while you reboot ... keep holding the button down until it ejects. If that doesn't work, this Apple note has some other steps.
See this Apple note on steps to take to deal with the grey screen.
Your iMac needs to be mid-2007 or newer with 2GB minimum memory (4GB+ is recommended) and 8GB or more of available disk space. You also should be at OS X 10.6.8 Snow Leopard to access the App store and install OS X 10.8 Mountain Lion.

My apple wont turn on. it gets stuck on the gray screen with the spinning wheel and the apple on the screen

My macbook air turns on but not completely, it gets stuck on the grays screen.   It shows an apple an a spinning wheel and that is as far as it gets. sometimes I can get to an screen that shows macintosh hd and i clicked on it and the computer turned off.

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 startup failure is to secure the 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 the last backup, you can skip this step.
There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
     a. Start up from 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.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You don't need a DVD if you're running OS X 10.7 or later.
b. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, start up from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
c. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start 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.
d. 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. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d 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 startup 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 start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up 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 started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
Start up in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to start 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 the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you start up 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, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 10. If you ever have another problem with the drive, replace it immediately.
If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup 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 restart as usual (i.e., not in safe mode.)
If the startup 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 the 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 restart as usual.
Step 9
If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.
Step 10
Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 11
Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
Step 12
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 startup 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 13
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.

Always Shuts down at gray screen with spinning gear

Hi All
I think this may be a serious problem
Macbook was working fine then during downloading an app I got a message 'do you want to shutdown' i clicked cancel but re appeared with same message.
I shut down macbook and restarted and booted up to grey screen with spinning gear then off, the whole macbook switched off. I tried to reboot but everytime it switched off at the same point.
I tried to boot from DVD install disk but done the same, tried booting into safe mode but shut off at about 25% on the loading bar. Have reset everything and tried again but still the same prob.
Replaced the hard drive with a spare which had windows 7 on, still didnt allow me to boot from dvd disk but it stopped at the message ' do you want to start windows in safe mode' along with all the other options. I left it at that screen for about 45 mins and the ,acbook never switched off. So i now figured I may have a bad DVD osx disk, A frien of mine has Mountain lion on usb stick, so i borrowed and booted from the usb, got to the screen with the spinning gear and then....it switched off.
Checked fan while booting and all seems fine.
So my question is why is it shutting down, also why does it not shutdown before the spinning gear screen. It cant be over heating as above i fitted a hdd with win7 on and left it at the prompt for 45 mins.
Many thanks for looking
laurie

Hi Nance,
Welcome to the Discussions.
Put Install Disc 1 in the drive and start while holding down the "c" key. Select Disk Utility from the Installer menu, click on the drive on the left and click on Repair Disk. If it reports errors and repairs, repeat the process until no errors are reported.
Post back the results and any unrepaired error messages.
John

Startup unsucessful stuck on gray screen with spinning gear-type thing

I think it may have been because i tripped over my macs powercord and it shut down that my computer wont start anymore, i tried safe boot etc... but nothing works it's just stuck on the startup screen, if anyone has any clue as to how i can resolve my issue, i'd be extremely greatful

Shturts,
Welcome to the Apple Discussions!
How long did you give it to Start Up in Safe Mode? It can take upwards of 20 minutes for an eMac to start in Safe Mode as a faceless version of Repair Disk runs in the background at the gray screen / Apple logo / spinning gear stage.
If Safe Boot isn't finishing after 30 or more minutes, use your OS X install disk to boot the computer and run Repair Disk, as described in Using Disk Utility and fsck. If any errors are reported repaired, repeat Repair Disk until it either reports no erros found or unable to repair, in which case you should consider investing in a copy of DiskWarrior.

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FWIW, have a look at this user tip.

Gray screen with ? at start up

When I try to turn on my IMAC it is a white screen with a folder with a question mark in it. Any ideas?

Symptoms
If you see a flashing question mark when you start your Mac, it's probably because it can't find the system software it needs to start up. Usually, all you have to do to get your Mac back up and running is remind it where its software is.
Resolution
If your computer starts up normally after a brief delay, you probably just need to reselect the startup disk in Startup Disk preferences. It's normal to see the flashing question mark when a startup disk has not been selected. In most cases, reselecting the startup disk is all that is required to resolve the issue.
Sometimes, your computer may not start beyond the flashing question mark.
Tip: If your computer has a gray screen (with no flashing question mark) startup issue, see Mac OS X: Gray screen appears during startup.
Check the mouse and keyboard
This issue might occur if a mouse or trackpad button is pressed during startup. Make sure the button isn't pressed.
If the issue persists, shut down your Mac with its power button, disconnect any external mouse and keyboard, then turn on your Mac with its power button. If the flashing question mark issue persists, reconnect the keyboard and mouse.
Additional steps
If your Mac still starts to a flashing question mark, follow the steps below. If any step resolves the issue, you don't need to continue to the next one.
Select your Mac OS X startup disk with Startup Manager by restarting and holding the Option key. After your Mac starts up, restart again to verify that the flashing question mark does not appear.
If the issue persists, insert your Mac OS X installation disc. Be sure to either use the disc that came with your Mac, or, if you installed a later Mac OS X version from disc, use the newer disc.
Restart the computer, then hold the C key during startup.
From the Utilities menu, choose Disk Utility. Don't click Continue.
Select your Mac OS X disk (named "Macintosh HD" by default) in the left side of the Disk Utility window.
Click the First Aid tab.
Click Repair Disk to verify and repair any issues with your Mac OS X startup disk.
After repairing the disk, try to start up normally.
Important: If Disk Utility finds issues it cannot repair, you may need to back up as much of your data as possible (or use Time Machine to back up to a different disk), then erase the disk and reinstall Mac OS X. You should back up important files and data before erasing a drive. Erasing deletes everything on the hard disk (including things on your desktop). Also, you can install Mac OS X onto an external disk, start from the external disk, and use Migration Assistant to transfer items from your usual internal Mac OS X startup disk to the external disk, then erase the internal disk and reinstall Mac OS X.
If the issue persists, and Disk Utility didn't find any irreparable issues, quit Disk Utility, quit the Installer, select your disk when prompted, and restart.
If the issue continues, reset PRAM. Note: After resetting PRAM, if the computer starts up normally, reselect the startup disk in the Startup Disk preferences.
If none of these steps resolve the issue, start up from the Mac OS X Installation disc and reinstall Mac OS X.

My MacBook Pro stated that it needed to be updated. I clicked yes to restart the computer and update but when it restarted it stays on the gray screen with the apple logo and then pops up, stating "unable to find driver for this platform." What do I do?

My MacBook Pro stated that it needed to be updated. I clicked yes to restart the computer and update but when it restarted it stays on the gray screen with the apple logo and then pops up, stating "unable to find driver for this platform." What do I do?

Boot into Recovery by holding down the key combination command-R at the startup chime. Release the keys when you see a gray screen with a spinning dial.
Note: You need an always-on Ethernet or Wi-Fi connection to the Internet to use Recovery. It won’t work with USB or PPPoE modems, or with networks that require any kind of authentication other than a WPA or WPA2 Personal password.
When the Mac OS X Utilities screen appears, follow the prompts to reinstall the Mac OS. You don't need to erase the boot volume, and you won't need your backup unless something goes wrong. If your Mac didn’t ship with Lion, you’ll need the Apple ID and password you used to upgrade, so make a note of those before you begin.
Don't install the Thunderbolt update -- it's defective.

My MacBook Air can't get past the gray screen with the apple logo. What's the fix?

My MacBook Air can't get past the gray screen with the Apple logo, so I can't login. Does anyone know the fix for this?

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 Recovery by holding down the key combination command-R at the startup chime, or from a local Time Machine backup volume (option key at startup.) Release the keys when you see a gray screen with a spinning dial. When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in the support article linked below, under “Instructions for backing up to an external hard disk via Disk Utility.”
How to back up and restore your files
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 by holding down the key combination command-T at the startup chime. Connect the two Macs with a FireWire or Thunderbolt cable. The internal drive of the machine running in target mode will mount as an external drive on the other machine. Copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
How to use and troubleshoot FireWire target disk mode
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
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.
Before reconnecting an external storage device, make sure that your internal boot volume is selected in the Startup Disk pane of System Preferences.
Step 3
Boot in safe mode.* The instructions provided by Apple are as follows:
Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.
When you see the gray Apple logo, release the shift key.
If you are prompted to log in, type your password, and then hold down the shift key again as you click Log in.
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.
*Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t boot in safe mode. Post for further instructions.
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 damaged and the drive is probably malfunctioning. In that case, go to step 5.
If you can boot and log in now, 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 4
Sometimes a boot failure can be resolved by resetting the NVRAM.
Step 5
Launch Disk Utility in Recovery mode (see above for instructions.) 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 produces. Look for the line "Permissions repaired successfully" at the end of the output. Then reboot as usual.
Step 6
Boot into Recovery again. When the OS X Utilities screen appears, follow the prompts to 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.
Note: You need an always-on Ethernet or Wi-Fi connection to the Internet to use Recovery. It won’t work with USB or PPPoE modems, or with proxy servers, or with networks that require a certificate for authentication.
Step 7
Repeat step 6, 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 backup.
Step 8
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store to have the machine tested.

Grey Screen with Apple Spinning Wheel

Hi All-
here is the deal. A mac here had to do a hard shut down due to a failed update.
I've ran DU from the DVD installer/also ran Disk W.
Still hung on the grey screen.
Ran DU again off of DVD. Permissions fine, but repair disk gave me this:
Incorrect number of file hard links
Invalid node structure
Volume check failed
ERROR: File system verify or repair failed.
So, now what?
Thoughts?
Also, the last restart the machine ran in grey screen for about 15 sec. then turned it's self off?
Thanks,
Larry

I'm having a similar problem with my iBook G4... only when I get to the gray screen with he spinning wheel it sits there for a while and then it reboots its self, in an endless loop.
I can boot from the install DVD, and I was able to run a permissions repair and a disk repair using disk utility, but that didn't stop the eternal reboot loop. So I'm thinking my only remaining option is to reinstall OS X. However my hard drive is too full for the archive and install, so here's my question. Can I use Disk Utility to make a copy, or a disk image of my iBook's hard drive onto an external drive, then do an erase and install on my iBook, then go back to the external drive and get the files I need off the disk image? (I'm really only concerned about my documents, photos, music & movies).
I've learned my lesson and will start using Time Machine on the new external drive I'm gonna have to buy.
Thanks in advance for the help.

I have an iMac G5 stuck on the gray screen with spinning gear. I woke up to it being stuck on a blue screen, then force quit and now it's stuck on gray with spinning gear.

I have an iMac G5 stuck on the gray screen with spinning gear. I woke up to it being stuck on a blue screen, then force quit and now it's stuck on gray with spinning gear. Please advise.

If you have a G5 then it's a PPC (Power PC) based iMac, this is an Intel iMac forum. Try the Gray screen appears during startup link for troubleshooting steps. I suspect the HD has crashed.

I have an iMac from 2008. When I start I get gray screen with apple and turning gear. Next blue screen. Then light blue screen with turning gear. Back to blue screen. Now just back and forth blue to light blur

I have an iMac from 2008. When I start I get gray screen with apple and turning gear. Next blue screen. Then light blue screen with turning gear. Back to blue screen. Now just back and forth blue to light blur

Reinstall OS X:
Reinstall OS X without erasing the drive
Do the following:
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 the Combo Updater for the version you prefer from support.apple.com/downloads/.
Reinstalling 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: Select Reinstall Lion and click on the Continue button.
Note: You can also re-download the Lion installer by opening the App Store application. Hold down the OPTION key and click on the Purchases icon in the toolbar. You should now see an active Install button to the right of your Lion purchase entry. There are situations in which this will not work. For example, if you are already booted into the Lion you originally purchased with your Apple ID or if an instance of the Lion installer is located anywhere on your computer.

My iMac won't boot up fully. It stays stuck in the gray screen with the pinwheel spinning, then after about 5 minutes just shuts itself off.

My iMac won't boot up fully. It stays stuck in the gray screen with the pinwheel spinning, then after about 5 minutes just shuts itself off.

Try SMC Reset (unplug it from the back of the computer for 10 seconds then plug it back. in)
Try PRAM Reset Cmd + OPtion + P + R on start up.
Try safe boot - hold down shift on start up.
Try booting to install dvd (C on start up) or recovery hd (CMD + R) and using disk utility to run a verify and repair. If you still can't boot after that reinstall the operating system. If you can't find the disc or it wont boot to the disc.
Try single mode which is cmd+S on start up. It will open with a terminal looking window in the terminal. type in /sbin/fsck -TL. If it returns *system has been modified* continue to type that command in until it comes back with macintosh hd seems to be ok. If after 5 tries it still gives you system has been modified. You may have to replace the hard drive.

My imac is stuck in gray screen with spinning wheel

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Welcome to Apple Support Communities
Press Shift key on boot and check that the computer starts. Finally, restart

IMac gray screen (with frozen "spinning gear") during startup

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