Table 2-6Solving Display Problems (continued)

Blank screen and the power LED flashes Red five times, once every second, followed by a two second pause, and the computer beeps five times. (Beeps stop after fifth iteration but LEDs continue flashing.)

Cause

Solution

 

 

 

 

3.

Replace third-party memory with HP memory.

 

4.

Replace the system board.

 

 

 

Blank screen and the power LED flashes Red six times, once every second, followed by a two second pause, and the computer beeps six times. (Beeps stop after fifth iteration but LEDs continue flashing.)

Cause

Solution

 

 

Pre-video graphics error.

For systems with a graphics card:

1.Reseat the graphics card. Power on the system.

2.Replace the graphics card.

3.Replace the system board.

For systems with integrated graphics, replace the system board.

Blank screen and the power LED flashes Red seven times, once every second, followed by a two second pause, and the computer beeps seven times. (Beeps stop after fifth iteration but LEDs continue flashing.)

Cause

Solution

 

 

System board failure (ROM detected failure prior to video).

Replace the system board.

 

Monitor does not function properly when used with energy saver features.

 

 

Cause

Solution

 

 

Monitor without energy saver capabilities is being used with

Disable monitor energy saver feature.

energy saver features enabled.

 

 

 

Dim characters.

 

 

 

Cause

Solution

 

 

The brightness and contrast controls are not set properly.

Adjust the monitor brightness and contrast controls.

 

 

Cables are not properly connected.

Check that the graphics cable is securely connected to the

 

graphics card and the monitor.

 

 

Blurry video or requested resolution cannot be set.

 

 

 

Cause

Solution

 

 

If the graphics controller was upgraded, the correct graphics

Install the video drivers included in the upgrade kit.

drivers may not be loaded.

 

 

 

Monitor is not capable of displaying requested resolution.

Change requested resolution.

 

 

Graphics card is bad.

Replace the graphics card.

 

 

24 Chapter 2 Troubleshooting Without Diagnostics

ENWW

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HP dc7800 tower manual Dim characters Cause Solution
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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.
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