HP dc7900 manual Red Power LED flashes eight Invalid ROM based on bad

Page 65

Table A-2Diagnostic Front Panel LEDs and Audible Codes (continued)

Activity

Beeps

Possible Cause

Recommended Action

 

 

 

 

 

Red Power LED flashes eight

8

Invalid ROM based on bad

1.

Reflash the system ROM with the latest BIOS

times, once every second,

 

checksum.

 

image. See the “Boot Block Emergency

followed by a two second

 

 

 

Recovery Mode” section of the Desktop

pause. Beeps stop after fifth

 

 

 

Management Guide for more information.

iteration but LEDs continue

 

 

2.

Replace the system board.

until problem is solved.

 

 

 

 

 

 

 

Red Power LED flashes nine

9

System powers on but is

1.

Check that the voltage selector, located on

times, once every second,

 

unable to boot.

 

the rear of the power supply (some models),

followed by a two second

 

 

 

is set to the appropriate voltage. Proper

pause. Beeps stop after fifth

 

 

 

voltage setting depends on your region.

iteration but LEDs continue

 

 

2.

Unplug the AC power cord from the

until problem is solved.

 

 

 

 

 

 

computer, wait 30 seconds, then plug the

 

 

 

 

power cord back in to the computer.

 

 

 

3.

Replace the system board.

 

 

 

4.

Replace the processor.

 

 

 

 

 

Red Power LED flashes ten

10

Bad option card.

1.

Check each option card by removing the card

times, once every second,

 

 

 

(one at a time if multiple cards), then power

followed by a two second

 

 

 

on the system to see if fault goes away.

pause. Beeps stop after fifth

 

 

2.

Once a bad card is identified, remove and

iteration but LEDs continue

 

 

until problem is solved.

 

 

 

replace the bad option card.

 

 

 

3.

Replace the system board.

 

 

 

 

 

Red Power LED flashes eleven

11

The current processor

1.

Install a TXT capable processor.

times, once every second,

 

does not support a feature

2.

Disable TXT in the Computer Setup (F10)

followed by a two second

 

previously enabled on this

pause. Beeps stop after fifth

 

system.

 

utility.

iteration but LEDs continue

 

 

3.

Reinstall the original processor.

until problem is solved.

 

 

 

 

 

 

System does not power on and

None

System unable to power

Press and hold the power button for less than 4

LEDs are not flashing.

 

on.

seconds. If the hard drive LED turns green, the

 

 

 

power button is working correctly. Try the

 

 

 

following:

 

 

 

1.

Check that the voltage selector (some

 

 

 

 

models), located on the rear of the power

 

 

 

 

supply, is set to the appropriate voltage.

 

 

 

 

Proper voltage setting depends on your

 

 

 

 

region.

 

 

 

2.

Replace the system board.

 

 

 

OR

 

 

 

 

Press and hold the power button for less than 4

 

 

 

seconds. If the hard drive LED does not turn on

 

 

 

green then:

 

 

 

1.

Check that the unit is plugged into a working

 

 

 

 

AC outlet.

 

 

 

2.

Open hood and check that the power button

 

 

 

 

harness is properly connected to the system

 

 

 

 

board.

 

 

 

3.

Check that both power supply cables are

 

 

 

 

properly connected to the system board.

 

 

 

 

 

ENWW

Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 59

Image 65
Contents Troubleshooting Guide Troubleshooting Guide Iii Iv About This Book Table of contents Accessing DPS Through Computer Setup Solving Software Problems Contacting Customer SupportHP 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 Safety and Comfort Before You Call for Technical SupportHelpful Hints Helpful Hints Computer date and time display is incorrect Cause Solution Solving General Problems1Solving General Problems There is no sound or sound volume is too low Cause Solution Solving General ProblemsCannot remove computer cover or access panel Cause Solution Poor performance is experienced Cause SolutionYou do not want to launch automatically Cause SolutionEnww Power supply shuts down intermittently Cause Solution Solving Power Problems2Solving Power Problems Solving Power Problems 3Solving Diskette Problems Solving Diskette ProblemsDiskette drive light stays on Cause Solution Drive not found Cause SolutionCannot format diskette Cause Solution Solving Diskette ProblemsProblem has occurred with a disk transaction Cause Solution Diskette drive cannot read a diskette Cause SolutionStorage Boot Order Cannot Boot to Diskette Cause SolutionBoot Security Password Options4Solving Hard Drive Problems Solving Hard Drive ProblemsSolving Hard Drive Problems Storage Boot Order list Nonsystem disk/NTLDR missing message Cause SolutionComputer 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 6Solving Display Problems Solving Display ProblemsBlank screen no video Cause Solution Personalization, select Adjust screen resolutionDim characters Cause Solution Solving Display ProblemsSelect 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 8Solving Printer Problems Solving 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 SolutionDiagnostics reports a failure Cause Solution Network status link light never flashes Cause SolutionNew network card will not boot Cause Solution 13Solving Memory Problems Solving Memory ProblemsOut of memory error Cause Solution Memory count during Post is wrong Cause SolutionInsufficient memory error during operation Cause Solution Solving Memory Problems14Solving Processor Problems Solving 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 OptionsCannot eject compact disc tray-load unit Cause Solution Movie will not play in the DVD drive Cause SolutionEnww 16Solving USB Flash Drive Problems Solving 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 Click on System and Maintenance Solving Internet Access ProblemsDouble-clickAgere Systems PCI-SV92PP Soft Modem19Solving Software Problems Solving 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 Sata Under Storage DPS Self-testSelect Security Drivelock Security Emulation to IDE, and select File SaveEmulation back to RAID and select File Save Changes and ExitKeyboard failure while Network Server Mode Activity Beeps Possible Cause Recommended Action Table A-2Diagnostic Front Panel LEDs and Audible CodesReplace 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 Figure B-1 Cmos button Locate, press, and hold the Cmos button in for five secondsDrive Protection System DPS Select Storage DPS Self-Test Accessing DPS Through Computer SetupIndex 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.