HP Z1 Workstation - Manual (Page 22)

6. When cable connections are complete, carefully tilt the unit forwards, toward you.
Figure 3-5 Tilt the unit towards you after connecting cables
NOTE: Because the workstation is heavy and the stand joints are tight, you might need to exert
some force to maneuver the workstation.
7. Rotate the workstation to the upright position. Some force is required.
Figure 3-6 Rotate the workstation
14 Chapter 3 Setting up and using the workstation