http://h20000.www2.hp.com/bizsupport/TechSupport/D ocumentIndex.jsp?lang=en&cc=us&prodClassId=-1&cont entType=SupportManual&prodTypeId=12454&prodSeriesI d=3718668
Tam si stiahnes "HP Z Workstation series User Guide" alebo aj "HP Z400 Workstation Maintenance and Service Guide" je to napisane v oboch, ked to tam nevidis tak navstivit ocneho. Hladas slovo recovery a kapitolu using the recovery partition.
Macka sa F11 a musis sa trafit presne na spravny okamzik (ked to pise dole o F10 tak funguje aj F11).

P.S. pokial tam ale neni original disk ale niekto tam ten disk nacpal dodatocne, tak na nom pochopitelne ziaden recovery ulozeny neni.