HP dc7800 tower manual 1Solving General Problems

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Solving General Problems

You may be able to easily resolve the general problems described in this section. If a problem persists and you are unable to resolve it yourself or if you feel uncomfortable about performing the operation, contact an authorized dealer or reseller.

WARNING! When the computer is plugged into an AC power source, voltage is always applied to the system board. To reduce the risk of personal injury from electrical shock and/or hot surfaces, be sure to disconnect the power cord from the wall outlet and allow the internal system components to cool before touching.

Table 2-1Solving General Problems

Computer appears locked up and will not turn off when the power button is pressed.

Cause

Solution

 

 

Software control of the power switch is not functional.

1.Press and hold the power button for at least four seconds until the computer turns off.

2.Disconnect the power cord from the electrical outlet.

Computer will not respond to USB keyboard or mouse.

Cause

Solution

 

 

Computer is in standby mode.

To resume from standby mode, press the power button or press any key.

CAUTION: When attempting to resume from standby mode, do not hold down the power button for more than four seconds. Otherwise, the computer will shut down and you will lose any unsaved data.

System has locked up.

Restart computer.

 

 

Computer date and time display is incorrect.

Cause

Solution

 

 

RTC (real-time clock) battery may need to be replaced.

NOTE: Connecting the computer to a live AC outlet prolongs the life of the RTC battery.

First, reset the date and time under Control Panel (Computer Setup can also be used to update the RTC date and time). If the problem persists, replace the RTC battery. See the Hardware Reference Guide for instructions on installing a new battery, or contact an authorized dealer or reseller for RTC battery replacement.

Cursor will not move using the arrow keys on the keypad.

Cause

Solution

 

 

The Num Lock key may be on.

Press the Num Lock key. The Num Lock light should not be on if you want to use the arrow keys. The Num Lock key can be disabled (or enabled) in Computer Setup.

10 Chapter 2 Troubleshooting Without Diagnostics

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Contents Troubleshooting Guide Troubleshooting Guide Iii Iv About This Book Table of contents Accessing DPS Through Computer Setup HP Insight Diagnostics HP Insight DiagnosticsSurvey Tab Test Tab Log Tab Select a language and click Download Protecting the SoftwareProtecting the Software HP Backup and Recovery Manager Safety and Comfort Before You Call for Technical Support Safety and ComfortTroubleshooting Without Diagnostics Helpful HintsHelpful Hints 1Solving General Problems Solving General ProblemsComputer date and time display is incorrect Cause Solution Solving General Problems There is no sound or sound volume is too low Cause SolutionCannot remove computer cover or access panel Cause Solution Poor performance is experienced Cause SolutionCause Solution Cause unknown Restart the computerEnww 2Solving Power Problems Solving Power ProblemsPower supply shuts down intermittently Cause Solution Solving Diskette Problems Solving Diskette Problems3Solving Diskette Problems Cannot format diskette Cause Solution Problem has occurred with a disk transaction Cause SolutionDiskette drive cannot read a diskette Cause Solution Invalid system disk message is displayed Cause SolutionSecurity Password Options Solving Hard Drive Problems 4Solving Hard Drive ProblemsSolving Hard Drive Problems Storage Boot Order listComputer will not boot from hard drive Cause Solution Device ConfigurationTroubleshooting Without Diagnostics Solving Media Card Reader Problems Solving Media Card Reader Problems5Solving Media Card Reader Problems Can not write to the media card Cause SolutionTroubleshooting Without Diagnostics Solving Display Problems Solving Display Problems6Solving Display Problems Blank screen no video Cause SolutionDim characters Cause Solution Out of Range displays on screen Cause Solution Image is not centered Cause SolutionSelect ImageControl/ Horizontal Position or Vertical Certain typed symbols do not appear correct Cause Solution Solving Audio Problems Solving Audio Problems7Solving Audio Problems Sound cuts in and out Cause SolutionSound from headphones is not clear or muffled Cause Solution Line-in jack is not functioning properly Cause SolutionSolving Printer Problems Solving Printer Problems8Solving Printer Problems Solving Keyboard and Mouse Problems 9Solving Keyboard Problems10Solving Mouse Problems Select Shut DownSolving Keyboard and Mouse Problems 11Solving Hardware Installation Problems Solving Hardware Installation ProblemsComputer will not start Cause Solution Solving Hardware Installation Problems Goes awayOnce bad card is identified, remove and replace bad Option card12Solving Network Problems Solving Network ProblemsWake-on-LAN feature is not functioning Cause Solution Network status link light never flashes Cause Solution Solving Network ProblemsDiagnostics reports a failure Cause Solution New network card will not boot Cause Solution Solving Memory Problems Solving Memory Problems13Solving Memory Problems Troubleshooting Without Diagnostics Solving Processor Problems Solving Processor Problems14Solving Processor Problems Some fans only operate when neededSolving CD-ROM and DVD Problems 15Solving CD-ROM and DVD ProblemsMode in Security Password Options Movie will not play in the DVD drive Cause SolutionSolving CD-ROM and DVD Problems Cannot eject compact disc tray-load unit Cause SolutionSolving Drive Key Problems 16Solving Drive Key ProblemsUSB Drive Key not found identified Cause Solution System will not boot from USB Drive Key Cause SolutionSolving Front Panel Component Problems Solving Front Panel Component Problems17Solving Front Panel Component Problems 18Solving Internet Access Problems Solving Internet Access ProblemsUnable to connect to the Internet Cause Solution Solving Internet Access Problems Click on System and MaintenanceDouble-clickAgere Systems PCI-SV92PP Soft ModemSolving Software Problems 19Solving Software ProblemsContacting Customer Support Contacting Customer SupportPost Error Messages Post Numeric Codes and Text Messages Post Numeric Codes and Text MessagesTable A-1Numeric Codes and Text Messages Control panel message Description Recommended actionContact an authorized dealer or reseller for Advanced Onboard Devices Computer Setup or Windows utilities Under Storage DPS Self-test SataKeyboard failure while Network Server Mode Table A-2Diagnostic Front Panel LEDs and Audible Codes Activity Beeps Possible Cause Recommended ActionUse the Smart ID technology before Red Power LED flashes ten Bad option card Cmos Resetting the Password Jumper Resetting the Password JumperClearing and Resetting the Cmos Locate, press, and hold the Cmos button in for five seconds Figure B-1 Cmos buttonDrive Protection System DPS Accessing DPS Through Computer Setup Select Storage DPS Self-TestIndex
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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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