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D–4 360201-002 Service Reference Guide, dc5000
Troubleshooting Without Diagnostics
Solving Power Supply Problems
Solving Power Supply Problems
Problem Cause Solution
Power supply shuts down
intermittently.
Voltage selector switch
on rear of computer
chassis not switched to
correct line voltage.
Select the proper AC voltage.
Power supply fault. Replace the power supply.
Computer powered off
automatically and the
Power LED flashes Red two
times, once every second,
followed by a two second
pause.
Processor thermal
protection activated:
A fan may be blocked
or not turning.
OR
The heatsink/fan
assembly is not properly
attached to the
processor.
1. Ensure that the computer air
vents are not blocked and the
cooling fan is running.
2. Open hood, press the 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. Ensure
the fan is fully/properly seated
or installed.
3. Replace the processor fan.
4. Reseat processor heatsink and
verify that the fan assembly is
properly attached.
Power LED flashes Red,
once every two seconds.
Power failure (power
supply is overloaded).
1. Check that the voltage selector,
is set to the appropriate voltage.
2. Open the hood and ensure the
4-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). 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 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.
- 2nd edition 1
- Service Reference Guide 3
- 1st Edition (March 2004) 4
- 2nd Edition (April 2004) 4
- Contents 5
- 1.1 HP Software 10
- 2.2 Computer Setup Utilities 12
- 2.2.2 Computer Setup Menu 14
- 2.3 Diagnostics for Windows 22
- 2.4 Configuration Record 26
- 2.6 Protecting the Software 27
- 2.7 Restoring the Software 28
- Desktop Management 29
- 3.3.3 System Software Manager 31
- 3.4 ROM Flash 32
- 3.4.3 FailSafe Boot Block ROM 33
- 3.4.4 Replicating the Setup 34
- 3.4.5 Dual-State Power Button 34
- 3.4.6 Power Management 35
- 3.4.7 World Wide Web Site 35
- 3.5.1 Password Security 38
- Entering a Power-On Password 39
- Entering a Setup Password 39
- Clearing Passwords 41
- 3.5.4 DriveLock 42
- Using DriveLock 43
- DriveLock Applications 43
- 3.5.7 Cable Lock Provision 45
- 3.6.1 Drive Protection System 46
- 3.6.3 Thermal Sensor 46
- 4.1 Ultra ATA Jumpers 47
- 4.2 Ultra ATA Cables 47
- Single-Drive Cable 48
- Two-Drive Cable 48
- 4.3.1 Device Classes 49
- 4.4 SMART 52
- 4.5 Drive Capacities 53
- Disassembly Preparation 55
- 5.2.1 Generating Static 57
- 5.2.4 Grounding the Work Area 58
- 5.3 Routine Care 59
- 5.3.3 Cleaning the Keyboard 60
- 5.3.4 Cleaning the Monitor 60
- 5.3.5 Cleaning the Mouse 60
- 5.4 Service Considerations 61
- 5.4.4 Cables and Connectors 62
- 5.4.5 Hard Drives 62
- Microtower (µT) Chassis 63
- 6.2.2 Installing a Padlock 65
- 6.3 Access Panel 66
- 6.4 Front Bezel 67
- To reinstall the front bezel 69
- 6.5 Front Drive Bezels 70
- 6.5.2 Diskette Drive Bezel 71
- 6.6 Memory Modules 72
- 6.7 Expansion Cards 73
- 6.7.2 PCI Expansion Card 74
- 6.8 Drives 76
- 6.8.2 Removing a Drive 77
- Releasing the Drives 78
- 6.8.3 Installing a Drive 79
- Connecting Hard Drive Cables 81
- 6.9 Chassis Fan 82
- 6.11 Front I/O Devices 84
- 6.12 Power Switch Assembly 85
- 6.13 Processor and Heatsink 87
- 6.14 System Board 88
- 6.15 Battery 89
- 6.15.1 Type 1 Battery Holder 90
- 6.15.2 Type 2 Battery Holder 91
- 6.15.3 Type 3 Battery Holder 92
- 6.16 Speaker 93
- 6.17 Power Supply 94
- 7.2.1 Cable Lock 96
- 7.2.2 Pa d loc k 97
- 7.3 Com puter Access Pan el 98
- 7.4 Front Bezel 99
- 7.5 Front Drive Bezels 100
- 7.6 M emor y Modules 101
- 7.7 PCI Expansion Card 102
- 7.8 D r ives 105
- 7.8.2 Cable Routing 106
- 7.8.3 Optical Drive 107
- 7.8.5 Primar y H ard Drive 112
- 7.9 Fro n t I/O Devices 114
- 7.10 Power Switch Assembly 115
- 7.11 Sys t em Board 116
- 7.12 C h assis Fan 117
- 7.13 B a t te r y 118
- 7.14 Processor and Heatsink 121
- 7.15 S peaker 122
- 7.16 Power Supply 123
- Connector Pin Assignments 125
- Ethernet RJ-45 126
- Ethernet AUI 126
- Parallel Interface 127
- Microphone 127
- Headphone 128
- Line-In Audio 128
- Line-Out Audio 128
- Ultra SCSI 129
- External Infrared Transceiver 129
- 20-Pin Power 130
- 4-Pin Power (for CPU) 130
- Power Cord Set Requirements 131
- Country-Specific Requirements 132
- POST Error Messages 133
- Preliminary Checklist 141
- Solving Minor Problems 142
- Solving Power Supply Problems 144
- Solving Diskette Problems 145
- Solving Hard Drive Problems 146
- Solving Display Problems 149
- Solving Audio Problems 152
- Solving Printer Problems 154
- Solving Keyboard Problems 155
- Solving Network Problems 158
- Solving Memory Problems 160
- Solving Processor Problems 161
- Solving Drive Key Problems 163
- Designators 169
- AMD-Based Systems 171
- Intel-Based Systems 171
- DIMM Sockets 172
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