IBM Storwize V7000 Maintenance Manual page 104

10. Turn on the power switch to the power supply unit.
If required, return the power supply. Follow all packaging instructions, and use
any packaging materials for shipping that are supplied to you.
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Storwize V7000: Troubleshooting, Recovery, and Maintenance Guide
7. Push the power supply unit back into the enclosure until the handle starts to
move.
8. Finish inserting the power supply unit into the enclosure by closing the
handle until the locking catch clicks into place.
9. Reattach the power cable and cable retention bracket.