Lenovo ThinkSystem ST250 V2 Maintenance Manual page 182

There are no serviceable parts inside these components. If you suspect a problem with one of
these parts, contact a service technician.
Attention:
• Read the "Installation guidelines" on page 85 to ensure that you work safely.
• Turn off the server and peripheral devices, and disconnect the power cords and all external cables (see
"Power off the server" on page 13).
• If the server is in a rack, remove it from the rack.
• Remove any locking device that secures the server cover, such as a Kensington lock or a pad lock.
Watch the procedure
A video of this procedure is available at YouTube:
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Procedure
Step 1. Remove the server cover (see "Remove the server cover" on page 199).
Step 2. Disconnect all cables on the fixed power supply from the power distribution board.
Step 3. Remove a fixed power supply.
a. Remove the four screws at the rear of the chassis that secure the power supply.
b. Push the fixed power supply from the rear until it is released from the metal retaining tab,
and carefully lift the power supply out of the chassis.
Figure 98. Removing a fixed power supply
After this task is completed
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https://youtube.com/playlist?list=PLYV5R7hVcs-
.