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Erase and reinstall OS X mountain lion

1900 Views 15 Replies Latest reply: Feb 3, 2013 4:45 PM by willp240 RSS
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willp240 Calculating status...
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Jan 31, 2013 4:37 PM

I already have mountain lion installed on my iMac. However, due to problems and overall frustration, I want to erase everything and reinstall. I did the restart, cmd r, and opened the recovery. I downloaded ML again, which restarted the computer. I then had to restart again to get back not the recovery. I go nit the disk utility to erase what's there and reinstall ML, but it won't erase because it says it cant unmount. What am I doing wrong?

MacBook Pro, Mac OS X (10.7.3)
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