System Support

4.5.3 System Status

These systems provide a visual indication of system boot, ROM flash, and operational status through the power LED and internal speaker, as described in Table 13.

d

.

Table 4-13.

System Operational Status LED Indications

System Status

PowerLED

Beeps [2]

Action Required

S0: System on (normal operation)

Steady green

None

None

S1: Suspend

Blinks green @ .5 Hz

None

None

S3: Suspend to RAM

Blinks green @ .5 Hz

None

None

S4: Suspend to disk

Off – clear

None

None

S5: Soft off

Off – clear

None

None

Processor thermal shutdown

Blinks red 2 times @ I Hz [1]

2

Check air flow, fans, heatsink

Processor not seated / installed

Blinks red 3 times @ I Hz [1]

3

Check processor presence/seating

Power supply overload failure

Blinks red 4 times @ I Hz [1]

4

Check system board problem [3],

Memory error (pre-video)

Blinks red 5 times @ I Hz [1]

5

Check DIMMs, system board

Video error

Blinks red 6 times @ I Hz [1]

6

Check graphics card or system board

PCA failure detected by BIOS (pre-video)

Blinks red 7 times @ I Hz [1]

7

Replace system board

Invalid ROM checksum error

Blinks red 8 times @ I Hz [1]

8

Reflash BIOS ROM

Boot failure (after power on)

Blinks red 9 times @ I Hz [1]

9

Check power supply, processor, sys. bd

Bad option card

Blinks red 10 times @ I Hz [1]

None

Replace option card

NOTES:

Beeps are repeated for 5 cycles, after which only blinking LED indication continues.

[1]Repeated after 2 second pause.

[2]Beeps are produced by the internal chassis speaker.

[3]Check that CPU power connector P3 is plugged in.

4.5.4Thermal Sensing and Cooling

All systems feature a variable-speed fan mounted as part of the processor heatsink assembly. All systems also provide or support an auxiliary chassis fan. All fans are controlled through temperature sensing logic on the system board and/or in the power supply. There are some electrical differences between form factors and between some models, although the overall functionally is the same. Typical cooling conditions include the following:

1.Normal—Low fan speed.

2.Hot processor—ASIC directs Speed Control logic to increase speed of fan(s).

3.Hot power supply—Power supply increases speed of fan(s).

4.Sleep state—Fan(s) turned off. Hot processor or power supply will result in starting fan(s).

The RPM (speed) of all fans is the result of the temperature of the CPU as sensed by speed control circuitry. The fans are controlled to run at the slowest (quietest) speed that will maintain proper cooling.

✎Units using chassis and CPU fans must have both fans connected to their corresponding headers to ensure proper cooling of the system.

 

Technical Reference Guide

www.hp.com

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