Lenovo 653417U, Installation And User Manual

Page: 157 / 180

Table 18. System pulse LEDs (continued)
LED Description Action
IMM heartbeat IMM heartbeat boot process. The following steps describe the
different stages of the IMM heartbeat
sequencing process.
1. When this LED is flashing fast
(approximately 4Hz), 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
flashing slowing (approximately
1Hz), the IMM is fully
operational. You can now press
the power-control button to
power-on the server.
4. If this LED does not flash within
30 seconds of connecting a power
flash 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 20).
b. (Trained service technician
only) Replace the system
board.
Power-supply LEDs
The following minimum configuration is required for the DC LED on the power supply to be lit:
v
Power supply
v Power cord
The following minimum configuration is required for the server to start:
v One microprocessor in microprocessor socket 1
v
One 1 GB DIMM on the system board
v
One power supply
v
Power cord
v
ServeRAID SAS/SATA controller
v
Five cooling fans
The following illustration shows the locations of the power-supply LEDs.
Chapter 8. Solving problems
141