I have a 2012 Mac Mini. Most of my experience has been with PCs. The Mini works fine, but if I had to or wanted to, how would I re-install the operating? system.
Read http://www.dummies.com/how-to/content/how-to-install-or-reinstall-mac-os-x-mount ain-lion.html
If 10.7.0 or later...
Bootup holding CMD+r, or the Option/alt key to boot from the Restore partition.
Have a look at > OS X: About OS X Recovery
Retrieving data ...