HP ProDesk 400 G4 Disassembly Instructions Manual page 6

Figure 19 Use T-15 screwdriver to loose the screws and
remove heat sink
Figure 21 Separate the fan from CPU heat sink
Figure 23 Rotate the handle and open it up
EL-MF877-00
Template Revision B
PSG instructions for this template are available at
Figure 20 Use PH1 screwdriver to loose the screws and
remove the fan
Figure 22 Remove the Memory card from the board
Figure 24 Remove the CPU from the board
EL-MF877-01
Page 6