Dell XPS 720 H2C (Mid 2007) - Manual (Page 129)

Removing and Installing Parts
129
5 Remove any full-length expansion cards (see "Removing PCI and PCI Express Cards" on page 95).
6 Disconnect the liquid cooling assembly power cable.
7 Disconnect the liquid cooling assembly cable from the TEC_PUMP connector on the system board
(see "System Board Components" on page 89).
1 drive release latch 2 optical drive
2
1