The server's redundant hot-swappable power supplies enable you to remove and install a power supply without shutting the server down provided that at least to other power supplies are operating.
The following LEDs are lit when a power supply fault is detected:
Front and rear Service Required LEDs.
Amber Failure LED on the faulty power supply
If a power supply fails and you do not have a replacement available, leave the failed power supply installed to ensure proper air flow in the server.