Dell Dimension XPS T___ - Manual (Page 21)

When you reinstall the hard-disk drive assembly, make sure that the rails on the assembly slide into the grooves of the card guide assembly.
Power Supply
To remove the power supply, perform the following steps:
1. Disconnect the AC power cable from the power supply.
2. Disconnect the DC power cables from the POWER and 3.3 connectors on the system board.
3. Disconnect the DC power cables from all the drives.
4. Remove the two power-supply mounting screws from the back of the chassis.
5. Lift the power supply out of the chassis.
Chassis Cooling-Fan Assembly
To remove the chassis cooling-fan assembly, perform the following steps:
1. Disconnect the chassis cooling-fan cable from the J7M1 connector on the system board.
2. While you push the fan assembly upward, press the two release buttons on the back of the chassis and lift the fan assembly out of the
1 Power-supply mounting screws (2)
2 Power supply
1 Chassis cooling-fan assembly
2 J7M1 connector
3 Release buttons