HP dc7800 tower manual Clearing and Resetting the Cmos

Page 66

Clearing and Resetting the CMOS

The computer’s configuration memory (CMOS) stores information about the computer’s configuration.

The CMOS button resets CMOS but does not clear the power-on and setup passwords.

Clearing CMOS will clear the Active Management Technology (AMT) settings in the Management Engine BIOS Extension (MEBx), including the password. The password will default to “admin” and will need to be reset. The AMT settings will also need to be reset. To access the MEBx, press CTRL+P during POST.

1.Turn off the computer and any external devices, and disconnect the power cord from the power outlet.

2.Disconnect the keyboard, monitor, and any other external equipment connected to the computer.

WARNING! 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.

CAUTION: When the computer is plugged in, the power supply always has voltage applied to the system board even when the unit is turned off. Failure to disconnect the power cord can result in damage to the system.

Static electricity can damage the electronic components of the computer or optional equipment. Before beginning these procedures, ensure that you are discharged of static electricity by briefly touching a grounded metal object. See the Safety & Regulatory Information guide for more information.

3.Remove the computer cover or access panel.

CAUTION: Pushing the CMOS button will reset CMOS values to factory defaults. It is important to back up the computer CMOS settings before resetting them in case they are needed later. Back up is easily done through Computer Setup. See the Computer Setup (F10) Utility Guide for information on backing up the CMOS settings.

60 Appendix B Password Security and Resetting CMOS

ENWW

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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 Protecting the Software Select a language and click DownloadProtecting the Software HP Backup and Recovery Manager Safety and Comfort Before You Call for Technical Support Safety and ComfortTroubleshooting Without Diagnostics Helpful HintsHelpful Hints Solving General Problems 1Solving General ProblemsComputer date and time display is incorrect Cause Solution Cannot remove computer cover or access panel Cause Solution Solving General ProblemsThere is no sound or sound volume is too low Cause Solution Poor performance is experienced Cause SolutionCause Solution Cause unknown Restart the computerEnww Solving Power Problems 2Solving Power ProblemsPower supply shuts down intermittently Cause Solution Solving Diskette Problems Solving Diskette Problems3Solving Diskette Problems Diskette drive cannot read a diskette Cause Solution Cannot format diskette Cause SolutionProblem has occurred with a disk transaction Cause Solution Invalid system disk message is displayed Cause SolutionSecurity Password Options Solving Hard Drive Problems 4Solving Hard Drive ProblemsComputer will not boot from hard drive Cause Solution Solving Hard Drive ProblemsStorage Boot Order list Device ConfigurationTroubleshooting Without Diagnostics 5Solving Media Card Reader Problems Solving Media Card Reader ProblemsSolving Media Card Reader Problems Can not write to the media card Cause SolutionTroubleshooting Without Diagnostics 6Solving Display Problems Solving Display ProblemsSolving Display Problems Blank screen no video Cause SolutionDim characters Cause Solution Image is not centered Cause Solution Out of Range displays on screen Cause SolutionSelect ImageControl/ Horizontal Position or Vertical Certain typed symbols do not appear correct Cause Solution 7Solving Audio Problems Solving Audio ProblemsSolving 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 10Solving Mouse Problems Solving Keyboard and Mouse Problems9Solving Keyboard Problems Select Shut DownSolving Keyboard and Mouse Problems Solving Hardware Installation Problems 11Solving Hardware Installation ProblemsComputer will not start Cause Solution Once bad card is identified, remove and replace bad Solving Hardware Installation ProblemsGoes away Option cardSolving Network Problems 12Solving Network ProblemsWake-on-LAN feature is not functioning Cause Solution Solving Network Problems Network status link light never flashes Cause SolutionDiagnostics reports a failure Cause Solution New network card will not boot Cause Solution Solving Memory Problems Solving Memory Problems13Solving Memory Problems Troubleshooting Without Diagnostics 14Solving Processor Problems Solving Processor ProblemsSolving Processor Problems Some fans only operate when neededMode in Security Password Options Solving CD-ROM and DVD Problems15Solving CD-ROM and DVD Problems Movie will not play in the DVD drive Cause SolutionSolving CD-ROM and DVD Problems Cannot eject compact disc tray-load unit Cause SolutionUSB Drive Key not found identified Cause Solution Solving Drive Key Problems16Solving Drive Key Problems System will not boot from USB Drive Key Cause SolutionSolving Front Panel Component Problems Solving Front Panel Component Problems17Solving Front Panel Component Problems Solving Internet Access Problems 18Solving Internet Access ProblemsUnable to connect to the Internet Cause Solution Double-clickAgere Systems PCI-SV92PP Soft Solving Internet Access ProblemsClick on System and Maintenance ModemSolving Software Problems 19Solving Software ProblemsContacting Customer Support Contacting Customer SupportPost Error Messages Table A-1Numeric Codes and Text Messages Post Numeric Codes and Text MessagesPost Numeric 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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