HP dc7900 2Solving Power Problems, Power supply shuts down intermittently Cause Solution

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Solving Power Problems

Common causes and solutions for power problems are listed in the following table.

Table 2-2Solving Power Problems

Power supply shuts down intermittently.

Cause

Solution

 

 

Voltage selector switch on rear of computer chassis (some

Select the proper AC voltage using the selector switch.

models) not switched to correct line voltage (115V or 230V).

 

 

 

Power supply will not turn on because of internal power supply

Contact an authorized service provider to replace the power

fault.

supply.

 

 

Computer powered off automatically and the Power LED flashes Red two times, once every second, followed by a two second pause, and the computer beeps two times. (Beeps stop after fifth iteration but LEDs continue flashing.)

Cause

Solution

 

 

Processor thermal protection activated:

A fan may be blocked or not turning.

OR

The heatsink is not properly attached to the processor.

1.Ensure that the computer air vents are not blocked and the processor cooling fan is running.

2.Open hood, press power button, and see if the processor fan spins. If the processor fan is not spinning, make sure the fan's cable is plugged onto the system board header.

3.If fan is plugged in, but is not spinning, then replace the heatsink/fan assembly.

4.Contact an authorized reseller or service provider.

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

Cause

Solution

 

 

 

Power failure (power supply is overloaded).

1.

Check that the voltage selector, located on the rear of the

 

 

power supply (some models), is set to the appropriate

 

 

voltage. Proper voltage setting depends on your region.

 

2.

Open the hood and ensure the 4- or 6-wire power supply

 

 

cable is seated into the connector on the system board.

 

3.

Check if a device is causing the problem by removing ALL

 

 

attached devices (such as hard, diskette, or optical

 

 

drives, and expansion cards). Power on the system. If the

 

 

system enters the POST, then power off and replace one

 

 

device at a time and repeat this procedure until failure

 

 

occurs. Replace the device that is causing the failure.

 

 

Continue adding devices one at a time to ensure all

 

 

devices are functioning properly.

 

4.

Replace the power supply.

 

5.

Replace the system board.

 

 

The incorrect external power supply adapter is being used on

The USDT power supply adapter must be at 135W and use the

the USDT.

Smart ID technology before the system will power up. Replace

 

 

 

14 Chapter 2 Troubleshooting Without Diagnostics

ENWW

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Contents Troubleshooting Guide Troubleshooting Guide Iii Iv About This Book Table of contents Solving Software Problems Contacting Customer Support Accessing DPS Through Computer SetupHP Insight Diagnostics HP Insight DiagnosticsSurvey Tab Test Tab Log Tab Protecting the Software Protecting the SoftwareClick the Download button HP Backup and Recovery Manager Safety and Comfort Before You Call for Technical Support Safety and ComfortHelpful Hints Helpful Hints Computer date and time display is incorrect Cause Solution Solving General Problems1Solving General Problems 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 You do not want to launch automaticallyEnww Power supply shuts down intermittently Cause Solution Solving Power Problems2Solving Power Problems Solving Power Problems Solving Diskette Problems 3Solving Diskette ProblemsDiskette drive light stays on Cause Solution Drive not found Cause SolutionSolving Diskette Problems Cannot format diskette Cause SolutionProblem has occurred with a disk transaction Cause Solution Diskette drive cannot read a diskette Cause SolutionCannot Boot to Diskette Cause Solution Storage Boot OrderBoot Security Password Options4Solving Hard Drive Problems Solving Hard Drive ProblemsSolving Hard Drive Problems Nonsystem disk/NTLDR missing message Cause Solution Storage Boot Order listComputer will not boot from hard drive Cause Solution Device ConfigurationAgain Can not write to the media card Cause Solution Solving Media Card Reader Problems5Solving Media Card Reader Problems Solving Media Card Reader Problems Solving Display Problems 6Solving Display ProblemsBlank screen no video Cause Solution Personalization, select Adjust screen resolutionSolving Display Problems Dim characters Cause SolutionSelect ImageControl/ Horizontal Position or Vertical Image is not centered Cause SolutionOut of Range displays on screen Cause Solution Certain typed symbols do not appear correct Cause Solution Sound cuts in and out Cause Solution Solving Audio Problems7Solving Audio Problems Advanced Device Options Internal Speaker Solving Audio ProblemsLine-in jack is not functioning properly Cause Solution Solving Printer Problems 8Solving Printer ProblemsSolving Keyboard and Mouse Problems Solving Keyboard and Mouse Problems9Solving Keyboard Problems 10Solving Mouse ProblemsEnww Solving Hardware Installation Problems Solving Hardware Installation Problems11Solving Hardware Installation Problems Computer will not start Cause SolutionOption card Goes awayOnce bad card is identified, remove and replace bad Solving Network Problems Solving Network Problems12Solving Network Problems Wake-on-LAN feature is not functioning Cause SolutionNetwork status link light never flashes Cause Solution Diagnostics reports a failure Cause SolutionNew network card will not boot Cause Solution Solving Memory Problems 13Solving Memory ProblemsOut of memory error Cause Solution Memory count during Post is wrong Cause SolutionSolving Memory Problems Insufficient memory error during operation Cause SolutionSolving Processor Problems 14Solving Processor ProblemsSome fans only operate when needed Make sure the processor heatsink is installed properlySolving CD-ROM and DVD Problems Solving CD-ROM and DVD Problems15Solving CD-ROM and DVD Problems Mode in Security Password OptionsMovie will not play in the DVD drive Cause Solution Cannot eject compact disc tray-load unit Cause SolutionEnww Solving USB Flash Drive Problems 16Solving USB Flash Drive ProblemsUSB flash drive not found identified Cause Solution System will not boot from USB flash drive Cause Solution17Solving Front Panel Component Problems Solving Front Panel Component ProblemsSolving Front Panel Component Problems Unable to connect to the Internet Cause Solution Solving Internet Access Problems18Solving Internet Access Problems Solving Internet Access Problems Click on System and MaintenanceDouble-clickAgere Systems PCI-SV92PP Soft ModemSolving Software Problems 19Solving Software ProblemsContacting Customer Support Post 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 Verify monitor is attached and turned Under Storage DPS Self-test SataEmulation to IDE, and select File Save Select Security Drivelock SecurityEmulation back to RAID and select File Save Changes and ExitKeyboard failure while Network Server Mode Table A-2Diagnostic Front Panel LEDs and Audible Codes Activity Beeps Possible Cause Recommended ActionReplace one device at a time and repeat Red Power LED flashes eight Invalid ROM based on bad Enww Cmos Resetting the Password Jumper Clearing 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 Index
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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.
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