IBM System x3500 Service Manual page 15

System-information LED: When this amber LED is on, the server power supplies
are nonredundant, or some other noncritical event has occurred. The event is
recorded in the error log. Check the light path diagnostic panel for more information.
System-error LED: When this amber LED is lit, it indicates that a system error has
occurred. Use the diagnostic LED panel and the system service label on the inside
of the left-side cover to further isolate the error.
USB 1: Connect a USB device to this connector.
USB 2: Connect a USB device to this connector.
DVD-eject button: Press this button to release a CD or DVD from the DVD drive.
Hard disk drive status LED: When this LED is lit, it indicates that the associated
hard disk drive has failed. If an optional RAID 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 controller is identifying the drive.
Hard disk drive activity LED: When this LED is flashing, it indicates that the drive
is in use.
Hard disk drive status LED: On some server models, each hot-swap hard disk
drive has a status LED. When this LED is lit, it indicates that the drive has failed. If
an optional IBM ServeRAID controller is installed in the server, when this LED is
flashing slowly (one flash per second), it 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.
DVD drive activity LED: When this LED is lit, it indicates that the DVD drive is in
use.
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Chapter 1. Introduction