HP EliteDesk 800 G4 Disassembly Instructions Manual page 6

Figure 19 Remove ODD from ODD cage
Figure 21 Use T15 screwdriver to unscrew the screw and
remove the heatsink
EL-MF877-00
Template Revision B
PSG instructions for this template are available at
Figure 20 Disconnect CPU fan cable from MB
Figure 22 Use PH1 screwdriver to break up the heatsink
into fan and cooler
EL-MF877-01
Page 6