IBM 84875MU User Manual page 15

Hot-swap hard disk drive status LED
On some server models, each hot-swap hard disk drive has a status LED. If
the status LED for a drive is lit continuously, that individual drive is faulty.
When the drive is connected to an optional ServeRAID
flashing (one flash per second) status LED indicates that the drive is being
rebuilt. When the LED is flashing rapidly (three flashes per second), it
indicates that the controller is identifying the drive.
Power-on LED
When this LED is lit and not flashing, it indicates that the server is turned
on. When this LED is flashing, it indicates that the server is off and still
connected to an ac power source (standby mode).
Power-control button
Press this button to turn the server on and off manually.
System-error LED
When this LED is lit, it indicates that a system error has occurred. An LED
on the system board might also be lit to help isolate the error. See
"System-board LEDs" on page 72 for additional information.
USB ports
Connect a USB device to these connectors.
Ethernet link status LED
This LED is on the Ethernet connector on the back of the server. When this
LED is lit, it indicates that there is an active connection on the Ethernet
port.
Ethernet transmit/receive activity LED
This LED is on the Ethernet connector. When this LED is lit, it indicates that
there is activity between the server and the network.
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Chapter 1. Introduction