HP Model 712/100 - Workstation Handbook page 116

6. Remove the plunger.
Pull the plunger straight out until it disengages from the power board switch.
Slide the plunger from the chassis.
7. Remove the power board.
Lift the front of the power board, then pull it toward the front of the unit until it
disengages from the grounding clip.
WARNING: Use only power supply Model ETYHP127MM with
the A2657A /C2963/64A Hard Disk Drive.
8. Remove the bottom HP PAC.
9. Remove the SCSI ribbon cable.
From the back of the unit, use a small flat–blade screwdriver to remove the four
screws that hold the SCSI ribbon cable connectors in place.
5–40 Field Replaceable Units