IMac fail to reinstall OSX

I tried to do partition, reinstall OSX. After it download OSX Mountain Lion and reboot, it stuck on the gray apple logo. Is there any step to do a proper reinstallation? right now my mac is without any OS.

Not sure what to suggest from here, but will the Mac boot into the Recovery HD where you can then use Disk Utility to check whether the drive needs any repairs. Restart holding down Command + r - more info here:
http://support.apple.com/kb/HT4718

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  • Imac won't reinstall osx. It says my apple id hasn't purchased lion

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    Hi,
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    Thanks for the answer...that's what I was thinking.
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    1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
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    Hello,
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  • Cannot reinstall osx

    Just got this computer last week. We followed the instructions to restore to factory defaults and are now trying to reinstall osx. It starts out by saying that it is going to take about 15 hours to install and then ends up crashing. It has done this for days and never gets any closer than about 7 hours to being finished. What can we do to get osx back on the computer?

    Just for clarification, this was a brand new iMac that we purchased directly from Apple. It is a 27in, with 8GB RAM, 1T HD, and a 2.7GHz i5 processor. It came installed with OS X 10.8 Mountain Lion. No disks were provided with the computer.
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    Sep 25 20:38:20 localhost Unknown[287]: 2012-09-25 20:38:20.144 OS X Utilities[312:707] Invalid URL passed to an open/save panel: '(null)'.  Using 'file://localhost/' instead.
    Sep 25 20:38:23 localhost Unknown[287]: 2012-09-25 20:38:23.110 OS X Utilities[312:707] *** WARNING: -[NSImage compositeToPoint:operation:] is deprecated in MacOSX 10.8 and later. Please use -[NSImage drawAtPoint:fromRect:operation:fraction:] instead.
    Sep 25 20:38:23 localhost Unknown[287]: 2012-09-25 20:38:23.110 OS X Utilities[312:707] *** WARNING: -[NSImage compositeToPoint:fromRect:operation:] is deprecated in MacOSX 10.8 and later. Please use -[NSImage drawAtPoint:fromRect:operation:fraction:] instead.
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  • Can't reinstall OSX lion

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  • Cant reinstall osx lion on new hard drive

    I recently have been having problems with my 2007 Macbook 2,1 (yeah, I know it's old but it works...or worked anyway) taking forever to boot up.  So, I backed up all of my data to an external drive, erased the drive and then attempted to reinstall osx lion (which was the current os on the machine prior to erasing) via the internet recovery option as I no longer have the original start up disc.  The progress bar gets all the way to the end and then just takes me back to the main OSX utilities page.  Tried reformatting the drive again and same thing.  So then I resorted to creating a bootable thumb drive.  I booted back into OSX utilities via this drive and tried to reinstall this way only to get an error message that it cant download additional files needed to install osx.
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    Did you prep the new drive correctly? You also need to install Snow Leopard on the new drive and update it to 10.6.8.
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  • Cannot log into any GUI modes and need to reinstall OSX

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    You have to start the miniSAP instance before you can log in to it.
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    If you get messages in the DOS window saying processes died check that MS loopback is running.
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