HP dc5750 manual Resetting the Password Jumper

Page 66

Resetting the Password Jumper

To disable the power-on or setup password features, or to clear the power-on or setup passwords, complete the following steps:

1.Shut down the operating system properly, then turn off the computer and any external devices, and disconnect the power cord from the power outlet.

2.With the power cord disconnected, press the power button again to drain the system of any residual power.

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 Hardware Reference Guide on the Documentation and Diagnostics CD for more information.

3.Remove the computer cover or access panel.

4.Locate the header and jumper.

NOTE The password jumper is green so that it can be easily identified. For assistance locating the password jumper and other system board components, see the Illustrated Parts Map (IPM) for that particular system. The IPM can be downloaded from http://www.hp.com/ support.

5.Remove the jumper from pins 1 and 2. Place the jumper on either pin 1 or 2, but not both, so that it does not get lost.

6.Replace the computer cover or access panel.

7.Reconnect the external equipment.

8.Plug in the computer and turn on power. Allow the operating system to start. This clears the current passwords and disables the password features.

9.To establish new passwords, repeat steps 1 through 4, replace the password jumper on pins 1 and 2, then repeat steps 6 through 8. Establish the new passwords in Computer Setup. Refer to the Computer Setup (F10) Utility Guide on the Documentation and Diagnostics CD for Computer Setup instructions.

60 Appendix B Password Security and Resetting CMOS

ENWW

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Contents Troubleshooting Guide dc5750 Models Troubleshooting Guide Iii Iv About This Book Table of contents Appendix B Password Security and Resetting Cmos Accessing DPS Through Computer SetupHP Insight Diagnostics HP Insight DiagnosticsSurvey Tab Status Tab Log Tab Protecting the Software Select a language and click DownloadProtecting the Software Restoring the Software Safety and Comfort Before You Call for Technical Support Safety and ComfortHelpful Hints Helpful Hints Solving General Problems 1Solving General ProblemsComputer date and time display is incorrect Cause Solution Solving General Problems There is no sound or sound volume is too low Cause SolutionPoor performance is experienced Cause Solution Cause Solution Enww 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 SolutionOverrides the Boot Order enable command Security Password OptionsSolving Hard Drive Problems 4Solving Hard Drive ProblemsComputer will not boot from hard drive Cause Solution Solving Hard Drive ProblemsStorage Boot Order list Device ConfigurationCan not write to the media card Cause Solution Solving Media Card Reader Problems5Solving Media Card Reader Problems Computer’s software is used to safely eject the cardSolving Media Card Reader Problems Solving Display Problems 6Solving Display ProblemsBlank screen no video Cause Solution Solving Display Problems Dim characters Cause SolutionAdjust the horizontal or vertical position of the image Install the video drivers included in the upgrade kitImage is not centered Cause Solution Out of Range displays on screen Cause SolutionCertain typed symbols do not appear correct Cause Solution Solving Audio Problems 7Solving Audio ProblemsSound cuts in and out Cause Solution Properties Solving Audio ProblemsOn the Properties tab, make sure Enable digital CD Audio for this CD-ROM device is checkedSolving Printer Problems 8Solving Printer Problems9Solving Keyboard Problems Solving Keyboard and Mouse ProblemsSolving Keyboard and Mouse Problems 10Solving Mouse ProblemsOption and then press the Enter key After the shutdown is complete, plug the mouseRestart 11 Solving Hardware Installation Problems Solving Hardware Installation ProblemsSolving Hardware Installation Problems Computer will not start Cause SolutionOnce bad card is identified, remove and replace bad 11Solving Hardware Installation ProblemsGoes away Option card12Solving Network Problems Solving Network ProblemsSolving Network Problems Wake-on-LAN feature is not functioning Cause SolutionDiagnostics reports a failure Cause Solution Network status link light never flashesNew network card will not boot Cause Solution Out of memory error Cause Solution Solving Memory Problems13Solving Memory Problems Memory count during Post is wrong Cause SolutionSolving Memory Problems Some fans only operate when needed Solving Processor Problems14Solving Processor Problems Make sure the processor heatsink is installed properly15Solving CD-ROM and DVD Problems Solving CD-ROM and DVD ProblemsSolving 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 USB 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 Solving Internet Access Problems Double-clickPorts COM & LPTSolving Software Problems 19Solving Software ProblemsContacting Customer Support Contacting Customer SupportEnww Post Error Messages Table A-1Numeric Codes and Text Messages Appendix a Post Error MessagesPost Numeric Codes and Text Messages Control panel message Description Recommended actionPost Numeric Codes and Text Messages Advanced Onboard Devices Control panel message Description Replace diskette driveUnder Storage DPS Self-test Problem Problem goes away Network Server Mode Active and No Emulation back to RAID and select FileSave Changes and Exit Table A-2Diagnostic Front Panel LEDs and Audible Codes Is not spinning, make sure the fans cable is Activity Beeps Possible Cause Recommended Action Properly connected to the system board Check that both power supply cables areProblem persists, replace the system board Check to see if the 5Vaux light onCmos Resetting the Password Jumper Clearing and Resetting the Cmos Using Computer Setup to Reset CmosFigure B-1 Cmos switch Drive Protection System DPS Accessing DPS Through Computer Setup Select Storage DPS Self-TestIndex IndexEnww

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