I get white screen with logo after update OS 10.6.6

Yesterday I download the update, get the message intall and turn off so I did it.
Today i turn on the imac and it wont start, i get the white screen with the logo. I´ve triied almost everything...
Change disc permissions
Veryfy disc
Restart on safe mode
Turn on and off
Please help!

Try booting from your install disc again. Make sure that error was corrected.
Insert your install disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu and launch Disk Utility.
(In Mac OS X 10.4 or later, you must select your language first from the installer menu)
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
(Check S.M.A.R.T Status of HDD at the bottom of right panel. It should say: Verified)
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
When you are finished with DU, from the Menu Bar, select Utilities/Startup Manager.
Select your startup disk and click Restart
While you have the Disk Utility window open, look at the bottom of the window. Where you see Capacity and Available. Make sure there is always 15% free space.

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