HP ProOne 600 Hardware Reference Manual page 26

5.
Place the computer face down on a soft flat surface. HP recommends that you set down a blanket,
towel, or other soft cloth to protect the bezel and screen surface from scratches or other damage.
WARNING!
and raise the display to the highest position.
Do not lay the computer down with the sliding stand in the low position. The stand may suddenly
release, which could cause injury or damage to equipment.
Figure 2-13
6. Push the base of the stand down (1), and loosen the captive screws securing the stand to the unit
(2).
Figure 2-14
20 Chapter 2 Hardware repair and upgrade
Before laying the computer down for service, first grasp the sides of the display
Preparing to remove the height-adjustable/recline stand
Releasing the stand