IMac wont boot into OSX

Hi, I'm experiencing a strange problem with my late 2010 27" iMac. This morning when I went to turn it on the start up chime didn't sound, then after the apple logo appeared on screen a loading bar flashed up underneath it then it just turned off.
I tried booting from an external hard drive with Snow Leopard installed on it, by holding down option at start up, but after selecting the external drive the computer just hangs at the apple screen. I also tried to boot from my installation discs that came with the iMac but it just froze at the drive select screen after selecting the dvd, the same happened with a Snow Leopard installation disc.
After resetting the pram and nvram the start up chime now sounds again, and the computer now hangs at the apple logo when I try to boot from the installation dvds instead of freezing at the boot selection.
I did a hardware check by holding down command and d at starup and the scan returned no problems.
If I try to boot in verbose mode i get an error saying that fsck exits through signal 8 (atleast that's the gist of it, it shuts down to quickly for me to copy it word for word).
Here's where the problem gets really strange though, after trying multiple live cd's I have laying around most of them freezing at some point during the boot up, I've found that the Windows 7 64 bit installation disc and Ubuntu Natty 64 bit both boot fine from disc. From the Ubuntu live cd I've managed to mount my Mac's hard drive and everything still seems to be there. I've noticed that with both these discs I get 2 dvd boot options at the boot selection screen, one saying windows (regardless of weather it is actually the windows disc) and one saying efi boot, if I select the one saying efi boot, again, the computer just hangs at the apple screen.
I've got no idea what to try now or where to go next, I've tried running fsck through ubuntu but unfortunately my disk is journeled, does anyone have any idea what happening?
*edit, I forgot to mention that I dont have the necessary fire wire for target disk mode and I can't seem to type anything in single usr mode.

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Application Launch Failures & wont boot into OSX!!

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It means required system files are corrupted. You may not need to reformat the hard drive and reinstall OS X by doing an Archive and Install:
How to Perform an Archive and Install
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.) 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 quit DU and return to the installer.
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I reinstalled osx 10.8.2 from recovery disk, now verify disk says my hard drive is there but wont boot into it regardless which partition i select to boot into , everytime it boots me into the recovery, i need help!

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Your rushing and not making much sense.
Your machine was running like garbage, so you tried to reinstall 10.8---did you do this or not?
Disk Utility says your drive is ok, that's good.
But when you boot it keeps booting Recovery HD, so perhaps the firmware has made a mistake, it can forget.
You held the option key down to boot into Startup Manager, why didn't you select OS X for the boot volume?
When you get into OS X you change the Startup Disk in System Preferences, that should take care of the Flashing Question mark issue.
attemtping to ireinstall osx from recovery partition bar is full on install screen, but im now at -6hours remaining
So now your reinstalling OS X like you set out to do before, it does take some time as it has to download from Apple's servers.
If your Internet connection is slow and/or Wifi is slow then it will take awhile.
So you should have the Flashing Question Mark and Reinstall Only OS X covered.
You should be able to boot the machine, but your performance issues may be something else and still remain.
Why is my computer slow?
Step by Step to fix your Mac
https://discussions.apple.com/community/notebooks/macbook_pro?view=documents#/?p er_page=50

IMac wont boot up

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invalid node structure
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My imac wont boot and a small square shows up next to the cursor

Hi
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Imac wont boot, stuck loading, all i see is apple logo and spinning cycle

My 27 inch iMac wont boot, i am runnign snow leopard. I just see the apple sign and the cycle spinning meaning its still loading. I cant use disk utility because leopard install disc wont boot, also i cant run any commands in single user mode, doing /sbin/fsck -fy does nothing, i dont see a # sign or anything, whatever i type it doesnt matter whenever i hit return the cursor just goes to the line below.

dudix wrote:
I cant use disk utility because leopard install disc wont boot
Power down (assume you have already tried the SMC reset) and insert the Applications DVD that came with your new iMac. Boot up while holding the "D" key down (may be best with a wired keyboard) to run the Apple Hardware Test according to these instructions:
http://support.apple.com/kb/HT1509

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cfcboy77 wrote:
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Imac wont boot - i get a white screen with apple logo, and it loads to about 10%, then screen goes black

imac wont boot - i get a white screen with apple logo, and it loads to about 10%, then screen goes black

Hey there mtriest,
It sounds like you are unable to boot the iMac successfully as it keeps shutting down when you try to boot. I suggest the troubleshooting from the following article named:
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/ts2570
Disconnect, test peripheral devices and network cables
Note: "Peripheral devices" refers to external devices other than what came with your Mac, such as hard drives, printers, or hubs that you connect via a USB or FireWire cable.
Shut down your Mac. If necessary, hold your Mac's power button for several seconds to force it to power down.
Disconnect all peripheral devices such as external hard drives or printers (leave only the display, a keyboard, and mouse connected).
Disconnect any Ethernet cables.
Start up your Mac.
If you can start up this way, one or more of your peripheral devices (or installed software related to the device) is probably causing the gray screen issue. Connect one device, then restart your Mac to test for the issue. Repeat the process until you locate the device at issue. Make sure the device is powered if it needs to be to operate correctly. Check with the manufacturer of the device for support or possible software driver or firmware updates that may be available for the device. Try a different cable with the device if possible (such as a different USB or FireWire cable).
Note: If you have multiple peripheral devices and the issue only occurs when they are all connected, but not when each device is the only peripheral connected, see the Additional Information section below.
If you are using a desktop Mac with a third-party keyboard and/or mouse device, and the issue still occurs, try starting up with an Apple keyboard and mouse connected instead. Try starting with no keyboard and mouse connected, then connect them after start up. Also, try a different USB port on your Mac.
If the gray screen issue persists with no devices connected, go to the next section (with the peripherals still disconnected).
Perform a Safe BootSimply performing a Safe Boot may resolve this issue.
Shut down your Mac. If necessary, hold your Mac's power button for several seconds to force it to power down.
Start your Mac, then immediately hold the Shift key. This performs a Safe Boot. Advanced tip: If you want to see the status of a Safe Boot as it progresses, you can hold Shift-Command-V during start up (instead of just Shift).
Note: A Safe Boot takes longer than a typical start up because it includes a disk check and other operations.
If your Mac starts up as expected, immediately try restarting.
If the Safe Boot does not work, or the restart after a successful Safe Boot does not work, go to the next section.
There is additional information in the article with further troubleshooting if needed.
Thank you for using Apple Support Communities.
Cheers,
Sterling

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Hi guys,
Just been working on iMac, forget the exact spec but it's a 24" Intel 2.something Core 2 Duo or whatever it is, 4gb DDR2 RAM, gotta be about 2 years old to the day and after my last 2 Macs have lasted forever, never developing a fault, I didn't take out Applecare... Perhaps I had a bit too much faith...
As I say, just working away and all of a sudden, upon putting a video in Quicktime to full screen, the whole image has kinda of condensed itself into the top 20% of the screen and started slightly flickering the image. I've tried quitting some of the programmes, but neither the mouse nor leyboard have been responding so I've just had to turn the computer off.
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I've reset the PRAM and that made it take longer before it froze but ultimately did nothing.
I've now tried getting it to boot from the Snow Leopard disc but this does the something, until after about 3 - 5 minutes, the screen goes all pshychedlic, like looking at an old school TV really close...
So looking for any suggestions on other things to try before I have to take to my local store... Any hazard a guess at what may be up with it?
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Ok, tried Safe Mode and that wont boot either. Saw a little progress bar on the grey screen though which made a change, but ultimately, it crashed once that had disappeared.
I've just noticed that at the point when the progress wheel stops spinning, a pattern of dead pixels appears across the screen that aren't there when the progress wheel is spinning.
The more I talk to people about this, the more graphics card seems to come back as the likely culprit, based on the fact that:
- it started by me putting a video to full screen
- the fact the display went weird when it first happened and also it plays up after it crashes with the psychedelic colours
- it wont boot from HD, disc or now in safe mode either, however it does run AHT fine.
- I've hoovered out the vents on the iMac and somehow it seems slower than it was before (bit odd)
- the dead pixel thing mentioned above
So now thinking it may be time to get a new graphics card?
Reckon this is likely, even though the AHT hasn't picked up any problems? As mentioned earlier, I'm not too concerned about it would seem it doesn't particularly test the graphics card too much, so all just seems to point towards it.
Anything else that I could do to single this out as the likely culprit?
Guess this is a chance to upgrade!

My iMac wont boot up properly. Stops at background pic, no dock, only little apple show up top and cursor sticks on little spinning wheel. Have to shut down manually in back and reboot to get it to work. Any ideas why this sometimes happens?

I'm running OSX 10.9.1 (13B42)
My problem is that occasionally my Mac wont boot properly. It gets to the background picture where the dock should open but it freezes there. The little apple shows up top left but nothing else and the cursor shows as the little spinning wheel that wont do anything. I can't click on the apple to restart, I have to switch off in back and then start up again. It usally boots all the way after that but I'm worried there's something up since this seems to be happeneing more frequently. Also I'm worried that having to manually shut down like that will somehow damage the software in time?
I tried a disk verify but there were no repairs needed. I repaired disk permissions too just in case but it still seems to happen every once in a while.
I've noticed recently that it happens the next reboot after I've been streaming movies online if that helps. Is there any reason for this and anything i can do to stop it in the future?

Thanks Paul, just ran the etrecheck you recommended and got this:
Hardware Information:
          iMac (21.5-inch, Mid 2011)
          iMac - model: iMac12,1
          1 2.5 GHz Intel Core i5 CPU: 4 cores
          4 GB RAM
Video Information:
          AMD Radeon HD 6750M - VRAM: 512 MB
System Software:
          OS X 10.9.1 (13B42) - Uptime: 0 days 0:45:16
Disk Information:
          ST3500418AS disk0 : (500.11 GB)
                    EFI (disk0s1) <not mounted>: 209.7 MB
                    Macintosh HD (disk0s2) /: 499.25 GB (350.35 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
          OPTIARC DVD RW AD-5690H
USB Information:
          Apple Inc. FaceTime HD Camera (Built-in)
          Samsung SCX-4600 Series
          Apple Inc. BRCM2046 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Apple Internal Memory Card Reader
          Apple Computer, Inc. IR Receiver
FireWire Information:
Thunderbolt Information:
          Apple Inc. thunderbolt_bus
Kernel Extensions:
          com.sophos.kext.sav          (8.0.14)
Startup Items:
          MobileBrServ: Path: /Library/StartupItems/MobileBrServ
Problem System Launch Daemons:
Problem System Launch Agents:
Launch Daemons:
          [loaded] com.adobe.fpsaud.plist 3rd-Party support link
          [loaded] com.adobe.SwitchBoard.plist 3rd-Party support link
          [loaded] com.anchorfree.ajaxserver.plist 3rd-Party support link
          [loaded] com.microsoft.office.licensing.helper.plist 3rd-Party support link
          [loaded] com.sophos.autoupdate.plist 3rd-Party support link
          [loaded] com.sophos.intercheck.plist 3rd-Party support link
          [loaded] com.sophos.notification.plist 3rd-Party support link
Launch Agents:
          [not loaded] com.adobe.AAM.Updater-1.0.plist 3rd-Party support link
          [loaded] com.adobe.CS5ServiceManager.plist 3rd-Party support link
          [loaded] com.sophos.uiserver.plist 3rd-Party support link
User Launch Agents:
          [loaded] com.adobe.AAM.Updater-1.0.plist 3rd-Party support link
          [failed] com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist 3rd-Party support link
          [loaded] com.divx.agent.postinstall.plist 3rd-Party support link
          [loaded] com.google.keystone.agent.plist 3rd-Party support link
User Login Items:
          iTunesHelper
          BitTorrent
Internet Plug-ins:
          Flip4Mac WMV Plugin: Version: 2.4.4.2 3rd-Party support link
          FlashPlayer-10.6: Version: 12.0.0.38 - SDK 10.6 3rd-Party support link
          OVSHelper: Version: 1.1 3rd-Party support link
          Flash Player: Version: 12.0.0.38 - SDK 10.6 3rd-Party support link
          Default Browser: Version: 537 - SDK 10.9
          DivXBrowserPlugin: Version: 2.2 3rd-Party support link
          QuickTime Plugin: Version: 7.7.3
          SharePointBrowserPlugin: Version: 14.0.0 3rd-Party support link
          JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Outdated! Update
Audio Plug-ins:
          BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
          AirPlay: Version: 1.9 - SDK 10.9
          AppleAVBAudio: Version: 2.0.0 - SDK 10.9
          iSightAudio: Version: 7.7.3 - SDK 10.9
3rd Party Preference Panes:
          DivX 3rd-Party support link
          Flash Player 3rd-Party support link
          Flip4Mac WMV 3rd-Party support link
          Growl 3rd-Party support link
Bad Fonts:
          None
Old Applications:
          /Library/Sophos Anti-Virus
                    SophosAntiVirus:          Version: 8.0.8.1 - SDK 10.5 3rd-Party support link
                    SophosAutoUpdate:          Version: 8.0.15 - SDK 10.5 3rd-Party support link
                    SophosUIServer:          Version: 8.0.21 - SDK 10.5 3rd-Party support link
                    InterCheck:          Version: 8.0.8.1 - SDK 10.5 3rd-Party support link
          VLC:          Version: 2.0.1 - SDK 10.5 3rd-Party support link
          Sophos Anti-Virus:          Version: 8.0.21 - SDK 10.5 3rd-Party support link
          Spotify:          Version: 0.8.4.93.gd9f49c35 - SDK 10.5 3rd-Party support link
          Install Spotify:          Version: 1.0 - SDK 10.5 3rd-Party support link
                    /Users/[redacted]/Downloads/Programs/Install Spotify.app
Time Machine:
          Time Machine not configured!
Top Processes by CPU:
               2%          WindowServer
               2%          EtreCheck
               0%          Google Chrome
               0%          hidd
               0%          SophosUIServer
Top Processes by Memory:
          438 MB          firefox
          139 MB          InterCheck
          119 MB          com.apple.IconServicesAgent
          106 MB          Google Chrome
          78 MB          mds_stores
Virtual Memory Information:
          370 MB          Free RAM
          1.59 GB          Active RAM
          1.25 GB          Inactive RAM
          813 MB          Wired RAM
          397 MB          Page-ins
          0 B          Page-outs
I have no idea what all the means, lol.

IMac wont boot and has yellow squares at launch!!!

Ok, so Friday as I come home from buying Snow Leopard all excited because I also bought an DVI to HDMI cable to hook my 24 inch 3.06 10.5.8 iMac up to my TV. So as my laptop is upgrading to snow leopard I decide to hook up the TV. I plug the cables in and all is good. I went out and downloaded an app called TV Row.
http://www.macupdate.com/info.php/id/30081
It takes front row and puts it on an external monitor. Perfect, they have a brand new update out for snow leopard (which the iMac doesn't have yet) so i think its all good. But when I restart the computer it wont boot and I get a crazy boot screen with light yellow squares everywhere. It gets to the grey apple logo and the gear spins for about a minute and then locks up. I noticed that it was extremely hot!! I went and got a fan and put on the back of it but if i leave it running for about 15 minutes it will burn my hand. I have network access to it so im completely backed up and and down to start from scratch on it. Any ideas. Ill link a picture of what the yellow squares look like.
http://gallery.me.com/lmbvideography#100387/photo_1
Please Help!!!

If you put the Mac OS X Install DVD in the drive and restart your computer while holding down the Option key, and then click on the DVD when it appears on the screen, are you able to boot into the Installer? If so, can you try reinstalling Mac OS X (using the Archive and Install option) or perhaps restoring from a Time Machine backup?
If you're not even able to boot from the DVD, I'd suggest calling in an appointment and taking it to Apple right away before any significant damage is caused to the hardware.

IMac Wont Boot Question.I cant find an answer.

Ok Heres the story.
I have an iMac 20" display Intel Core Duo.
I came home yesterday and it was locked up.. I had to turn it off manually.
When it rebooted it started up but was stuck with a folder with a "?" on it.
I know it has to be the HDD.
I booted it from the snow leopard DVD and went into disk utlilty and repaired and verified the disk. The HDD shoes up in disk utility with the Macintosh Partition.After I repaired it it still does not appear as an option to st it as a start up disc.. I dont think the HDD is bad.. But I am not an expert
To be honest I dont care about the iMac I just want the data. I back up but I did not do one in a month or so and there are some things I want. If I removed the HDD and plugged into another mac would I be able to get the data off? I have one of those sata to USB adapters..
Any help would be appreciated let me know if you have any ideas

Do you know why it shows up in Disk Utilty but it wont boot from it?
Because the computer can't find a bootable OS on it. This is much more complicated than just seeing the drive.
(57561)

IMac wont boot into OSX

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