Imac stuck on Blue screen after upgraded to 10.6.8 combo

Hello,
I been using imac since 2007, I started upgrading my imac this week from Tiger to Snow Leopard. I want to get mountain lion so I was doing the final upgarde from Snow Leopard 10.6.7 to 10.6.8 and it was almost completed the install when my screen went black. I shut down the computer and when it rebooted the screen stayed on blue and it's not moving. The wheel is spinning on the screen like it searching for something. I try to reboot in safe mode not doing anything. I don't have the original Tiger 10.4 disc that the iMac came with, all I have is the Snow Leopard disc that I just purchase to do the upgrade. I am stuck and I don't know what to do at this point...HELP!! Can anyone confirm if there is an issue with the Snow Leopard upgrade 10.6.8 combo. I downloaded it from the apple support site.

Hi, there is no problem with the combo10.6.8 for 99.99999% of the people.
Do NOT attempt to use a Tiger/10.4 Disc to repair anything even if you had one.
"Try Disk Utility
1. Insert the Mac OS X 10.6 Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
If it still reboots to the blue screen, reinstall 10.6.x
Then the big 10.6.8 Combo...
http://support.apple.com/kb/DL1399
Repair Permissions afterwords, reboot.

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