IBM System x3100 M4 Type 2582 Problem Determination And Service Manual page 33

Off: AC power is not present, or the power supply or the LED itself has
failed.
Flashing rapidly (4 times per second): The server is partially on, but
not ready to be fully turned on. The power-control button is disabled.
This will last approximately 1 to 3 minutes.
Flashing slowly (once per second): The server is ready to be turned
on. You can press the power-control button to turn on the server.
Lit: The server is turned on.
Hard disk drive activity LED
When this LED is flashing, it indicates that the associated hard disk drive is
in use.
System-error LED
When this yellow 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.
SeeChapter 3, "Diagnostics," on page 23 for additional information.
USB connectors
Connect USB devices to these connectors.
DVD-eject button
Press this button to release a CD or DVD from the DVD drive.
DVD drive activity LED
When this LED is lit, it indicates that the DVD drive is in use.
Hot-swap hard disk drive activity LED (some models)
On some server models, each hot-swap drive has a hard disk drive activity
LED. When this green LED is flashing, it indicates that the drive is in use.
When the drive is removed, this LED also is visible on the SAS/SATA
backplane, next to the drive connector. The backplane is the printed circuit
board behind drive bays 4 through 7 on 3.5-inch hard disk drive models.
Hot-swap hard disk drive status LED (some models)
On some server models, each hot-swap hard disk drive has an yellow
status LED. If this yellow status LED for a drive is lit, it indicates that the
associated hard disk drive has failed.
If an optional ServeRAID adapter is installed in the server and the LED
flashes slowly (one flash per second), the drive is being rebuilt. If the LED
flashes rapidly (three flashes per second), the adapter is identifying the
drive.
When the drive is removed, this LED also is visible on the SAS/SATA
backplane, below the hot-swap hard disk drive activity LED.
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Chapter 2. Introduction