I can not boot past the blue screen, but safe mode is fine...

I have no clue what I did...
Everything was working fine on my iMac (which is from like 2008). I did a file migration transfer from my Macbook pro to the iMac and everything seemed to be good. I could see everything, etc. I went to update the software on the iMac since the computer has not been used in a while. After everything updated and installed the computer restarted and has not been able to move past the blue screen when booting. I can start in safe mode just fine. I have done everything I can find on how to trouble shoot with no luck.
I have reinstalled the OS X
I have held down every combo of keys when restarting the computer
I have made sure the correct disk is highlighted for starting up
I have done everything I could find online...
I do not have the option to erase under the disk utility, or repair?
I am so lost and have no idea what to do. Did the migrate do this? I could use any help! Thank you.

Clean Install of Snow Leopard
Be sure to make a backup first because the following procedure will erase
the drive and everything on it.
     1. Boot the computer using the Snow Leopard Installer Disc or the Disc 1 that came
         with your computer.  Insert the disc into the optical drive and restart the computer.
         After the chime press and hold down the  "C" key.  Release the key when you see
         a small spinning gear appear below the dark gray Apple logo.
     2. 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 the hard drive entry from the left side list (mfgr.'s ID and drive
         size.)  Click on the Partition tab in the DU main window.  Set the number of
         partitions to one (1) from the Partitions drop down menu, click on Options button
         and select GUID, click on OK, then set the format type to MacOS Extended
         (Journaled, if supported), then click on the Apply button.
     3. When the formatting has completed quit DU and return to the installer.  Proceed
         with the OS X installation and follow the directions included with the installer.
     4. When the installation has completed your computer will Restart into the Setup
         Assistant. Be sure you configure your initial admin account with the exact same
         username and password that you used on your old drive. After you finish Setup
         Assistant will complete the installation after which you will be running a fresh
         install of OS X.  You can now begin the update process by opening Software
         Update and installing all recommended updates to bring your installation current.
Download and install Mac OS X 10.6.8 Update Combo v1.1.

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