Asus PB61V User Manual page 37

5. Align and place the heatsink and fan module on top of the screw
holes. Fasten the three (3) screws securing the fan, then fasten the
four (4) screws securing the CPU heatsink one by one in a diagonal
sequence as shown.
6. Connect the CPU fan cable.
1
3
4
2
1 4
3 2
ASUS Mini PC PB Series 37