Dell Vostro 3902 Mini Tower (Late 2013) - Manual (Page 17)

3. Disconnect the following power supply cables from the system board by pressing on the retention
latch and lifting it upwards.
• system board power cable [1]
• system fan power cable [2]
a. Remove the screws that secure the power supply to the computer.
4. Follow the steps below to remove the power supply unit:
a. Push-in on the blue release tab beside the power supply [1].
b. Slide the power supply unit towards the back and remove it from the computer.
Installing the Power Supply Unit (PSU)
1. Slide the PSU towards the back of the computer until it snaps into place.
2. Replace the screws to secure the power supply until to the computer.
3. Connect the power cables to the system board.
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