HP dc7900 manual Table A-2Diagnostic Front Panel LEDs and Audible Codes

Page 63

Interpreting POST Diagnostic Front Panel LEDs and Audible Codes

This section covers the front panel LED codes as well as the audible codes that may occur before or during POST that do not necessarily have an error code or text message associated with them.

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.

NOTE: If you see flashing LEDs on a PS/2 keyboard, look for flashing LEDs on the front panel of the computer and refer to the following table to determine the front panel LED codes.

Recommended actions in the following table are listed in the order in which they should be performed.

Not all diagnostic lights and audible codes are available on all models.

Table A-2Diagnostic Front Panel LEDs and Audible Codes

Activity

Beeps

Possible Cause

Recommended Action

 

 

 

 

Green Power LED On.

None

Computer on.

None

 

 

 

 

Green Power LED flashes

None

Computer in Suspend to

None required. Press any key or move the mouse

every two seconds.

 

RAM mode (some models

to wake the computer.

 

 

only) or normal Suspend

 

 

 

 

mode.

 

 

 

 

 

 

 

Red Power LED flashes two

2

Processor thermal

1.

Ensure that the computer air vents are not

times, once every second,

 

protection activated:

 

blocked and the processor cooling fan is

followed by a two second

 

A fan may be blocked or

 

running.

pause. Beeps stop after fifth

 

 

 

iteration but LEDs continue

 

not turning.

2.

Open hood, press power button, and see if

until problem is solved.

 

OR

 

the processor fan spins. If the processor fan

 

 

 

is not spinning, make sure the fan's cable is

 

 

The heatsink/fan

 

plugged onto the system board header.

 

 

 

 

 

 

assembly is not properly

3.

If fan is plugged in, but is not spinning, then

 

 

attached to the processor.

 

replace heatsink/fan assembly.

 

 

 

4.

Contact an authorized reseller or service

 

 

 

 

provider.

 

 

 

 

 

Red Power LED flashes three

3

Processor not installed

1.

Check to see that the processor is present.

times, once every second,

 

(not an indicator of bad

2.

Reseat the processor.

followed by a two second

 

processor).

pause. Beeps stop after fifth

 

 

 

 

iteration but LEDs continue

 

 

 

 

until problem is solved.

 

 

 

 

 

 

 

 

 

ENWW

Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 57

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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 Click the Download buttonProtecting the Software HP Backup and Recovery Manager Safety and Comfort Safety and Comfort Before You Call for Technical SupportHelpful Hints Helpful Hints Solving General Problems 1Solving General ProblemsComputer date and time display is incorrect Cause Solution Poor performance is experienced Cause Solution Solving General ProblemsThere is no sound or sound volume is too low Cause Solution Cannot remove computer cover or access panel Cause SolutionYou do not want to launch automatically Cause SolutionEnww Solving Power Problems 2Solving Power ProblemsPower supply shuts down intermittently Cause Solution Solving Power Problems Drive not found Cause Solution Solving Diskette Problems3Solving Diskette Problems Diskette drive light stays on Cause SolutionDiskette drive cannot read a diskette Cause Solution Solving Diskette ProblemsCannot format diskette Cause Solution Problem has occurred with a disk transaction Cause SolutionSecurity Password Options Cannot Boot to Diskette Cause SolutionStorage Boot Order BootSolving Hard Drive Problems Solving Hard Drive Problems4Solving Hard Drive Problems Device Configuration Nonsystem disk/NTLDR missing message Cause SolutionStorage Boot Order list Computer will not boot from hard drive Cause SolutionAgain Solving Media Card Reader Problems 5Solving Media Card Reader ProblemsCan not write to the media card Cause Solution Solving Media Card Reader Problems Personalization, select Adjust screen resolution Solving Display Problems6Solving Display Problems Blank screen no video Cause SolutionDim characters Cause Solution Solving Display ProblemsImage 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 Solving Audio Problems 7Solving Audio ProblemsSound cuts in and out Cause Solution Solving Audio Problems Line-in jack is not functioning properly Cause SolutionAdvanced Device Options Internal Speaker 8Solving Printer Problems Solving Printer Problems10Solving Mouse Problems Solving Keyboard and Mouse ProblemsSolving Keyboard and Mouse Problems 9Solving Keyboard ProblemsEnww Computer will not start Cause Solution Solving Hardware Installation ProblemsSolving Hardware Installation Problems 11Solving Hardware Installation ProblemsGoes away Once bad card is identified, remove and replace badOption card Wake-on-LAN feature is not functioning Cause Solution Solving Network ProblemsSolving Network Problems 12Solving Network ProblemsDiagnostics reports a failure Cause Solution Network status link light never flashes Cause SolutionNew network card will not boot Cause Solution Memory count during Post is wrong Cause Solution Solving Memory Problems13Solving Memory Problems Out of memory error Cause SolutionInsufficient memory error during operation Cause Solution Solving Memory ProblemsMake sure the processor heatsink is installed properly Solving Processor Problems14Solving Processor Problems Some fans only operate when neededMode in Security Password Options Solving CD-ROM and DVD ProblemsSolving CD-ROM and DVD Problems 15Solving CD-ROM and DVD ProblemsCannot eject compact disc tray-load unit Cause Solution Movie will not play in the DVD drive Cause SolutionEnww System will not boot from USB flash drive Cause Solution Solving USB Flash Drive Problems16Solving USB Flash Drive Problems USB flash drive not found identified 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 Modem Solving Internet Access ProblemsClick on System and Maintenance Double-clickAgere Systems PCI-SV92PP Soft19Solving Software Problems Solving Software ProblemsContacting Customer Support Post Error Messages Control panel message Description Recommended action Post Numeric Codes and Text MessagesPost Numeric Codes and Text Messages Table A-1Numeric Codes and Text MessagesContact an authorized dealer or reseller for Verify monitor is attached and turned Sata Under Storage DPS Self-testSave Changes and Exit Emulation to IDE, and select File SaveSelect Security Drivelock Security Emulation back to RAID and select FileKeyboard 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.

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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.

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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.