Lenovo 5458 Installation And Service Manual page 244

Figure 146. Fixed power supply removal
3. Remove the screw that holds the power supply to the rear of the chassis.
4. Loosen the captive thumbscrew that secures the power supply to the chassis
bottom.
5. Lift the power supply out of the bay.
What to do next
If you are instructed to return the server component or optional device, follow all
packaging instructions, and use any packaging materials for shipping that are
supplied to you.
Replacing the fixed power supply
Use this information to replace the fixed power supply.
Before you begin
When you remove or install the fixed power supply, observe the following
precautions.
Statement 8
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System x3250 M5 Type 5458: Installation and Service Guide