[Solved]Snow Leopard (OS X 10.6.2) can’t boot after upgrading to 10.6.2

After upgrading to Snow Leopard (OS X) 10.6.2 from 10.6.1, I found that my system could not boot, no matter what option I chose at the boot prompt (-x, -v, -s etc). After trying for nearly half an hour, I was about to give up. Finally, I tried replacing the kernel and it rocked! I think I should share my solution here because I couldn’t find something like that on Google.

What I did:
Replacing the kernel of OS X 10.6.2 by OS X 10.6. You can find the old kernel from your backup (if you have), or from the Snow Leopard installation disk.

Steps:

  1. Grab your OS X 10.6 installation disk.
  2. Boot the system using the external DVD-Rom or USB Flash Drive.
  3. After booting to the installation screen, select your language and continue.
  4. Open Terminal
  5. Type the following:
cp /mach_kernel /Volumes/XXX/

where XXX is the name of your system directory. If you are not sure how to find it, you can try to run:

df

Warning(Side Effect):
When the system upgrades to OS X 10.6.2, it upgrades both the kernel (the brain) and the apps (the body) to 10.6.2. Now, we are downgrading the brain back to 10.6. It may cause unexpected behavior because the brain and the body are speaking different languages. You can think about the problem this way: The brain is speaking an old language while the body understands the new language only. Will they get along together? May be. Only Apple knows the answer.

So do it at your own risk.

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