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Urgent help needed! Can no longer boot into OSX


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I knew I had no real idea what I was doing trying to copy a mach_kernel file I was given over the /mach_kernel, but what has happened is now I can't even boot into OSX.


It doesn't matter what boot parameter I choose, none work.


-s results in a black screen

-v shows a few lines of text output then goes to a black screen

-x shows the grey screen with the apple logo

no option results in the same as -x


All the above lock up the system and I have to reset.


I knew I shouldn't have messed with the mach_kernel!


Is there a way to fix or a means for me to get into a shell to copy the original mach_kernal back?



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