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I have an iMac desktop bought in 2008, and reinstalled Mac OS X Leopard 10.5.2. I can see the hard drive and open data on it. However the Mac will not read any CD/DVDs or install any software. I don't care about the data on it and just want to reinstall Leopard or Snow Leopard.

I can see the hard drive but all options under partition and erase are grayed out. The USB drive and externals don't read either.

I've tried:

  1. Disk Utility repair and verify permissions. The programs go through the motions saying everything is complete but nothing changes.
  2. Hold CMD + S

    mount -uw /
    rm /var/db/.AppleSetupDone
    shutdown -h now. 
    

That didn't work either.

How can I wipe the hard drive without using Disk Utility?

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