HP dc5850 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.Open the hood and ensure the 4- or 6-wire power supply cable is seated into the connector on the system board.

2.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.

3.Replace the power supply.

4.Replace the system board.

14 Chapter 2 Troubleshooting Without Diagnostics

ENWW

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Contents Troubleshooting Guide dc5850 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 Test Tab Log Tab Protecting the Software Protecting the SoftwareSelect a language and click Download 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 Poor performance is experienced Cause Solution Solving General Problems There 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 SolutionStorage Boot Order BootSecurity Password Options Storage Storage Options Removable MediaSolving Hard Drive Problems 4Solving Hard Drive ProblemsHard drive error occurs Cause Solution Disk transaction problem Cause SolutionSolving Hard Drive Problems Nonsystem disk/NTLDR missing message Cause SolutionStorage Boot Order list Computer will not boot from hard drive Cause SolutionComputer seems to be locked up Cause Solution Solving Media Card Reader Problems Solving Media Card Reader Problems5Solving Media Card Reader Problems Can not write to the media card Cause SolutionEnww Solving Display Problems Solving Display Problems6Solving Display Problems Blank screen no video Cause SolutionDim characters Cause Solution Install the video drivers included in the upgrade kit Image is not centered Cause SolutionOut of Range displays on screen Cause Solution Select ImageControl/ Horizontal Position or VerticalCertain typed symbols do not appear correct Cause Solution Solving Audio Problems Solving Audio Problems7Solving Audio Problems Sound cuts in and out Cause SolutionLine-in jack is not functioning properly Cause Solution Unsaved data8Solving Printer Problems Solving Printer ProblemsSolving Printer Problems Solving Keyboard and Mouse Problems 9Solving Keyboard Problems10Solving Mouse Problems Select Shut DownSolving Keyboard and Mouse Problems Computer will not start Cause Solution Solving Hardware Installation Problems11Solving Hardware Installation Problems Solving Hardware Installation Problems Goes awayOnce bad card is identified, remove and replace bad Option cardWake-on-LAN feature is not functioning Cause Solution Solving Network Problems12Solving Network Problems Diagnostics reports a failure Cause Solution Solving Network ProblemsNetwork status link light never flashes Cause Solution Network controller requires drivers Drivers for a new expansion board were installedNew network card will not boot Cause Solution 13Solving Memory Problems Solving Memory ProblemsSolving Memory Problems Enww Solving Processor Problems Solving Processor Problems14Solving Processor Problems Some fans only operate when neededMode in Security Password Options Solving CD-ROM and DVD Problems15Solving CD-ROM and DVD Problems Cannot eject compact disc tray-load unit Cause Solution Solving CD-ROM and DVD ProblemsMovie will not play in the DVD drive Cause Solution 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 Click on System and MaintenanceDouble-clickAgere Systems PCI-SV92PP Soft ModemSolving Software Problems 19Solving Software ProblemsContacting Customer Support Contacting Customer SupportPost 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 actionIf the error persists after replacing Memory modulesMemory modules, replace the system BoardFlash Screen Image Corrupted Flash Screen image has errors Clear CMOS. See Appendix BVerify monitor is attached and turned Replace the graphics card if possibleUnder Storage DPS Self-test Enww Is not spinning, make sure the fans cable is Table A-2Diagnostic Front Panel LEDs and Audible CodesActivity Beeps Possible Cause Recommended Action This procedure until failure occurs. Replace Device that is causing the failureReplace one device at a time and repeat Continue adding devices one at a time toCheck 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 CmosLocate, 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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