IMac Mountain Lion Komplett Zurücksetzen

Hallo,
ich habe mir einen neuen Mac Mini gekauft. Ich hab alles Daten meines Alten IMacs auf Ihn übertragen.
So jetzt will ich den IMac ( Mountain Lion ) so zurück setzen das ich diesen weiter verkaufen kann.
Also so wie er beim ersten einschalten anfängt. Komplett ohne Benutzer ect. Mit Eröffnungs Video usw.
Wie mach ich das am besten ?
Vielen Dank
Florian

I hope I understand you question.
Does this help?
http://support.apple.com/kb/HT5189

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