Boot stucked on a white screen & gray apple

Hello,
I am using an Imac purchased in 2010, operrating a Maverick OSX system.
Since 2 days, my Imac does not boot and gets stucked on the white screen with a grey appel, and a small grey square sticked to the mouse cursor.
I tryied all tips & tricks suggested by several osx websites (after having disconnected peripherals), I mean:
- reset nvram
- start in safe mode, I checked the hard drive with the disck utility and corrected several permissions; but the reboot gets fixed at the same level
- fsck
- resinstallation of a time machine system backup
- installation of a new version of osx
Noone of those operation helped.
Thinking it was an hardware element which had an impact of the OSX operations, I tryied to boot on the my Windows 7 via Bootcamp, and the Windows OS worked properly on my Imac !
So I really don't know what to do next; do you have an idea ?
Thanks in advance for your help .
Nicolas

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1. Turn off the computer by choosing Shut Down from the Apple menu, or by holding the power button until the computer turns off.
2. Unplug all cables from the computer, including the power cord.
3. Wait 10 seconds.
4. Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
5. Let go of the power button.
6. Press the power button once more to start up your iMac.
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1. Insert OS X Installer Disc into the optical drive.
2. Restart the computer.
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You need to do an Erase and Install or an Archive and Install depending on whether the hard drive is OK or needs to be reformatted.
Start by booting from your Leopard DVD. The rest is just following directions.
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.
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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.
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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.
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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:
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http://support.apple.com/kb/ts2570
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