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I accidentally deleted the files in /etc/ (yes into /private/etc) and my iMac gets stuck on a blue screen after the initial apple logo now. I tried to boot from install DVD but it hangs at the apple logo when I do that.

Any suggestions on how to fix or reinstall the OS?

This is an iMac with OS X Snow Leopard.

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See Startup key combinations for Intel-based Macs (HT1533) for a list of available key combinations during startup. In your case you should use either of

  • C: Start up from a bootable CD, DVD, or USB thumb drive (such as OS X install media)
  • Option ⌥: Start up in Startup Manager, where you can select an OS X volume to start from. In your case the volume to select is the OS X Snow Leopard DVD
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mentioned that i tried booting from DVD already, hangs at apple logo. The only non-regular mode I can boot into is single-user root mode. – davidosomething Jun 20 '12 at 17:00

My iMac would loose its boot sequence because I had it booting into Windows mode. What Apple told me to do was to hold down the Option ⌥ key while the machine was rebooting.

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