I was trying to install OS X 10.6.8 on my current version of OS X 10.6.4 on the imac 11. it gave me a message that the os m trying to install cannot be istalled on the current version of the os. i then opted to installing only the additional software

only to find that the programs installed are not working and they have deactivted the already installed software and they are also not working.
how do i revert the changes i hav done?..pls help. the computer does not boot, it does not even reach the login phase. it just shows the apple logo and the spinning gear forever.

If your computer is not booting from the system DVD that originally came w/your computer, try a utility DVD like DiskWarrior, TechTool Pro, etc. and run the programs.
If you do not have any utility DVDs, you will need to take a trip down to your local Apple Store or an AASP.

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