There are several threads on this website describing how to do a clean install of ML.
Here is a description: http://osxdaily.com/2012/07/25/how-to-clean-install-os-x-mountain-lion/
Or just try Google, or Youtube. Plenty of stuff out there now.
I used the above, to make a Mountain Lion installer on a 4Gb USB thumb drive, but there are some videos on YTube.
Here is a description: http://osxdaily.com/2012/07/25/how-to-clean-install-os-x-mountain-lion/
Or just try Google, or Youtube. Plenty of stuff out there now.
I used the above, to make a Mountain Lion installer on a 4Gb USB thumb drive, but there are some videos on YTube.