IBM x3400 7975 Problem Determination And Service Manual page 26

CD or DVD-eject button
CD or DVD drive activity LED
Ethernet transmit/receive activity LED
Ethernet link status LED
Hot-swap hard disk drive activity LED (some models)
Hot-swap hard disk drive status LED (some models)
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System x3400 Types 7973, 7974, 7975, and 7976: Problem Determination and Service Guide
Press this button to release a CD from the CD drive or a DVD from the
DVD drive.
When this LED is lit, it indicates that the CD drive or DVD drive is in use.
This LED is on the Ethernet connector on the rear of the server. When this
LED is lit, it indicates that there is activity between the server and the
network.
This LED is on the Ethernet connector on the rear of the server. When this
LED is lit, it indicates that there is an active connection on the Ethernet
port.
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 backplane,
next to the drive connector. The backplane is the printed circuit board
behind drive bays 4 through 11.
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
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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adapter is installed in the server and the LED