Table 11. System pulse LEDs
LED
Description
Action
Enclosure management heartbeat Power-on and power-off sequencing.
1. If the LED blinks at 1Hz, it is
functioning properly and no
action is necessary.
2. If the LED is not blinking, (trained
service technician only) replace
the system board.
IMM heartbeat IMM heartbeat boot process. The following steps describe the
different stages of the IMM heartbeat
sequencing process.
1. When this LED is blinking fast
(approximately 4Hz), this
indicates, that the IMM code is in
the loading process.
2. When this LED goes off
momentarily, this indicates that
the IMM code has loaded
completely.
3. When this LED goes off
momentarily and then starts
blinking slowing (approximately
1Hz), this indicates that IMM is
fully operational. You can now
press the power-control button
to power-on the server.
4. If this LED does not blink within
30 seconds of connecting a
power source to the server,
complete the following steps:
a. (Trained service technician
only) use the IMM recovery
jumper to recover the
firmware (see
“System-board
switches and jumpers” on
page 18).
b. (Trained service technician
only) replace the system
board.
Recovering the server firmware
Use this information to recover the server firmware.
Important: Some cluster solutions require specific code levels or coordinated code updates. If the device is
part of a cluster solution, verify that the latest level of code is supported for the cluster solution before you
update the code.
If the server firmware has become corrupted, such as from a power failure during an update, you can recover
the server firmware in one of two ways:
• In-band method: Recover server firmware, using either the boot block jumper (Automated Boot
Recovery) and a server Firmware Update Package Service Pack.
Chapter 3. Diagnostics 395
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