HP dc5750 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.

14 Chapter 2 Troubleshooting Without Diagnostics

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 Protecting the SoftwareSelect a language and click Download Restoring the Software 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 Poor performance is experienced Cause Solution Solving General ProblemsThere is no sound or sound volume is too low Cause Solution Cause Solution Enww Power supply shuts down intermittently Cause Solution Solving Power Problems2Solving Power Problems 3Solving Diskette Problems Solving Diskette ProblemsSolving Diskette Problems Cannot format diskette Cause Solution Problem has occurred with a disk transaction Cause SolutionDiskette drive cannot read a diskette Cause Solution Invalid system disk message is displayed Cause SolutionOverrides the Boot Order enable command Security Password OptionsSolving Hard Drive Problems 4Solving Hard Drive ProblemsSolving Hard Drive Problems Storage Boot Order listComputer will not boot from hard drive Cause Solution Device ConfigurationSolving Media Card Reader Problems 5Solving Media Card Reader ProblemsCan not write to the media card Cause Solution Computer’s software is used to safely eject the cardSolving Media Card Reader Problems Blank screen no video Cause Solution Solving Display Problems6Solving Display Problems Solving Display Problems Dim characters Cause SolutionInstall the video drivers included in the upgrade kit Image is not centered Cause SolutionAdjust the horizontal or vertical position of the image Out of Range displays on screen Cause SolutionCertain typed symbols do not appear correct Cause Solution Sound cuts in and out Cause Solution Solving Audio Problems7Solving Audio Problems Solving Audio Problems On the Properties tab, make sure Enable digital CDProperties Audio for this CD-ROM device is checkedSolving Printer Problems 8Solving Printer ProblemsSolving Keyboard and Mouse Problems Solving Keyboard and Mouse Problems9Solving Keyboard Problems 10Solving Mouse ProblemsRestart Option and then press the Enter keyAfter the shutdown is complete, plug the mouse Solving Hardware Installation Problems Solving Hardware Installation Problems11 Solving Hardware Installation Problems Computer will not start Cause Solution11Solving Hardware Installation Problems Goes awayOnce bad card is identified, remove and replace bad Option cardSolving 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 flashesNew 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 Solving 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 Drive Key Problems 16Solving Drive Key ProblemsUSB Drive Key not found identified Cause Solution System will not boot from USB Drive Key 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 Double-clickPorts COM & LPTSolving Software Problems 19Solving Software ProblemsContacting Customer Support Contacting Customer SupportEnww Post Error Messages Appendix a Post Error Messages Post Numeric Codes and Text MessagesTable A-1Numeric 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 Save Changes and Exit Problem Problem goes away Network Server Mode Active and NoEmulation back to RAID and select File Table A-2Diagnostic Front Panel LEDs and Audible Codes Is not spinning, make sure the fans cable isActivity Beeps Possible Cause Recommended Action Check that both power supply cables are Problem persists, replace the system boardProperly connected to 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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