HP dc7900 System Status, Thermal Sensing and Cooling, System Operational Status LED Indications

Models: dc7900

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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 4-8.

.

Table 4-8.

System Operational Status LED Indications

 

 

 

 

 

 

System Status

PowerLED

Beeps [2]

Action Required

 

S0: System on (normal

Steady green

None

None

operation)

 

 

 

 

 

 

 

 

 

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 @ 1 Hz [1]

2

Check air flow, fans, heatsink

 

Processor not seated / installed

Blinks red 3 times @ 1 Hz [1]

3

Check processor

 

 

 

 

presence/seating

 

 

 

 

 

 

Power supply overload failure

Blinks red 4 times @ 1 Hz [1]

4

Check system board problem

 

 

 

 

[3],

 

 

 

 

 

 

Memory error (pre-video)

Blinks red 5 times @ 1 Hz [1]

5

Check DIMMs, system board

 

Video error

Blinks red 6 times @ 1 Hz [1]

6

Check graphics card or

 

 

 

 

system board

 

 

 

 

 

 

PCA failure detected by BIOS

Blinks red 7 times @ 1 Hz [1]

7

Replace system board

 

(pre-video)

 

 

 

 

 

 

 

 

 

Invalid ROM checksum error

Blinks red 8 times @ 1 Hz [1]

8

Reflash BIOS ROM

 

Boot failure (after power on)

Blinks red 9 times @ 1 Hz [1]

9

Check power supply,

 

 

 

 

processor, sys. bd

 

 

 

 

 

 

Bad option card

Blinks red 10 times @ 1 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).

 

Technical Reference Guide

www.hp.com

4-13

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HP dc7900 manual System Status, Thermal Sensing and Cooling, System Operational Status LED Indications

dc7900 specifications

The HP dc7900 is a well-regarded desktop solution that serves as a testament to HP's commitment to performance, reliability, and user accessibility. Introduced as part of HP’s Compaq line and designed primarily for business professionals, the dc7900 combines powerful processing capabilities with a compact form factor that suits various office environments.

One of the standout features of the HP dc7900 is its robust configuration options. It typically comes equipped with Intel's Core 2 Duo or Quad processors, giving users the ability to handle demanding applications seamlessly. The inclusion of Intel's technologies, such as Intel vPro, enhances remote management and IT control, making it an ideal choice for businesses looking to streamline their operations.

The dc7900 is designed with flexibility in mind. It offers multiple form factors, including mini-tower, small form factor, and ultra-slim desktop configurations. This variety enables organizations to choose a model that best fits their workspace requirements, maximizing both efficiency and aesthetics. The small footprint models are particularly beneficial in space-constrained environments, while the mini-tower version provides expandability for future upgrades.

In terms of graphics capabilities, the HP dc7900 typically features integrated Intel graphics, with options to install discrete graphics cards for users who require enhanced visual performance. This makes the dc7900 suitable for tasks ranging from standard office applications to more graphics-intensive responsibilities.

Connectivity is another key characteristic of the HP dc7900. It is equipped with a variety of ports, including USB 2.0 and audio jacks, allowing users to connect peripherals easily. Additionally, the dc7900 supports legacy connections, making it easier for businesses with older equipment to integrate new systems without hassle.

Durability and reliability are hallmarks of the HP dc7900. Built with high-quality materials and subjected to rigorous testing, this desktop is designed to withstand the demands of a bustling office environment. Furthermore, HP's comprehensive warranty and support options assure businesses of the reliability of their investment.

The HP dc7900 is not just a powerful desktop; it’s a versatile and dependable solution for modern businesses. With its combination of performance, expandability, and solid build quality, the dc7900 remains a relevant choice for those looking to enhance their productivity and efficiency in the workplace.