Power and Signal Distribution

A dual-color LED located on the front panel (bezel) is used to indicate system power status. The front panel (bezel) power LED provides a visual indication of key system conditions listed as follows:

 

 

Table 7-5.

 

 

 

Power LED Indications

 

 

 

 

 

 

Power LED

Condition

 

 

Steady green

Normal full-on operation

 

 

Blinks green @ 0.5 Hz

Suspend state (S1) or suspend to RAM (S3)

 

 

Blinks red 2 times @ 1 Hz [1]

Processor thermal shut down. Check air flow, fan

 

 

 

operation, and CPU heat sink.

 

 

 

 

 

 

Blinks red 3 times @ 1 Hz [1]

Processor not installed. Install or reseat CPU.

 

 

Blinks red 4 times @ 1 Hz [1]

Power failure (power supply is overloaded). Check storage

 

 

 

devices, expansion cards and/or system board (CPU

 

 

 

power connector P3).

 

 

 

 

 

 

Blinks red 5 times @ 1 Hz [1]

Pre-video memory error. Incompatible or incorrectly seated

 

 

 

DIMM.

 

 

 

 

 

 

Blinks red 6 times @ 1 Hz [1]

Pre-video graphics error. On system with integrated

 

 

 

graphics, check/replace system board. On system with

 

 

 

graphics card, check/replace graphics card.

 

 

 

 

 

 

Blinks red 7 times @ 1 Hz [1]

PCA failure. Check/replace system board.

 

 

Blinks red 8 times @ 1 Hz [1]

Invalid ROM (checksum error). Reflash ROM using CD or

 

 

 

replace system board.

 

 

 

 

 

 

Blinks red 9 times @ 1 Hz [1]

System powers on but fails to boot. Check power supply,

 

 

 

CPU, system board.

 

 

 

 

 

 

Blinks red 10 times @ 1 Hz [1]

Bad option card.

 

 

No light

System dead. Press and hold power button for less than 4

 

 

 

seconds. If HD LED turns green then check voltage select

 

 

 

switch setting or expansion cards. If no LED light then check

 

 

 

power button/power supply cables to system board or

 

 

 

system board.

 

 

 

 

 

NOTE:

[1]Will be accompanied by the same number of beeps, with 2-second pause between cycles. Beeps stop after 5 cycles.

 

Technical Reference Guide

www.hp.com

7-7

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HP dc7800 tower manual Power LED Indications Condition, Dimm

dc7800 tower specifications

The HP dc7800 Tower is a powerful desktop computer designed for professional and enterprise environments. Known for its stability, performance, and versatility, this model has secured its place in a variety of business settings. Launched in the mid-2000s, it embodies HP’s commitment to quality and innovation.

One of the main features of the HP dc7800 is its form factor. The tower configuration allows for easy upgrades and maintenance, providing ample space for additional hard drives, memory, and other components. This level of accessibility makes it ideal for businesses that need to adapt their systems to changing requirements.

The dc7800 is powered by Intel's Core 2 Duo processors, offering dual-core technology that enhances multitasking capabilities. With clock speeds ranging from 1.8 GHz to 3.0 GHz, this system can handle demanding applications with relative ease. It also supports Intel's vPro technology, which allows for remote management and security features, making it an excellent choice for organizations prioritizing IT control.

Another notable characteristic is the support for up to 8GB of DDR2 RAM. This allows for efficient data processing and improved performance when running multiple applications simultaneously. Additionally, the dc7800 features multiple storage options, accommodating both SATA hard drives and solid-state drives, which can significantly enhance boot times and overall system responsiveness.

Connectivity options on the HP dc7800 are robust. It includes a variety of USB ports, audio jacks, and optional legacy ports, ensuring compatibility with a wide range of peripherals and accessories. Networking capabilities are also prominent, with built-in Gigabit Ethernet providing high-speed internet access.

Furthermore, the desktop tower is designed with energy efficiency in mind. It meets ENERGY STAR certification standards, which not only helps reduce operational costs but also minimizes environmental impact.

Overall, the HP dc7800 Tower embodies a blend of performance, expandability, and energy efficiency, making it a reliable choice for businesses in need of a robust desktop solution. With its legacy of dependability and its suite of modern technologies, it continues to serve as a valuable asset in enterprise environments.