IBM 7378 Problem Determination And Service Manual page 28

Hard disk drive activity LED
System-error LED
USB connectors
DVD-eject button
DVD drive activity LED
Hot-swap hard disk drive activity LED (some models)
Hot-swap hard disk drive status LED (some models)
Please see "Event logs" on page 23 for more information.
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IBM System x3400 M3 Types 7378 and 7379: Problem Determination and Service Guide
Flashing slowly (once per second): The server is turned off and is
ready to be turned on. You can press the power-control button to turn on
the server.
Lit: The server is turned on.
Fading on and off: The server is in a reduced-power state. To wake the
server, press the power-control button or use the IMM Web interface.
See "Logging on to the Web interface" on page 314 for information on
logging on to the IMM Web interface.
When this LED is flashing, it indicates that a hard disk drive is in use.
When this amber 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
Chapter 3, "Diagnostics," on page 23 for additional information.
Connect USB devices to these connectors.
Press this button to release a CD or DVD from the DVD drive.
When this LED is lit, it indicates that the DVD drive is in use.
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 and
bays 4 through 11 on 2.5-inch hard disk drive models.
On some server models, each hot-swap hard disk drive has an amber
status LED. If this amber 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.