HP Compaq dx2250 User Manual Page 126
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Solving Power Problems
Common causes and solutions for power problems are listed in the following table.
Table D-2 Solving Power Problems
Power supply shuts down intermittently.
Cause Solution
Voltage selector switch on rear of computer chassis (some
models) not switched to correct line voltage (115V or 230V).
Select the proper AC voltage using the selector switch.
Power supply will not turn on because of internal 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, 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.
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.
120 Appendix D Troubleshooting Without Diagnostics ENWW
- Service Reference Guide 1
- About This Book 3
- Table of contents 5
- Backing Up the CMOS 19
- Restoring the CMOS 19
- 3 HP Insight Diagnostics 21
- Survey Tab 22
- Test Tab 22
- Status Tab 23
- Help Tab 24
- Protecting the Software 25
- Restoring the Software 25
- 4 Desktop Management 27
- HP OpenView Agent 28
- Remote System Installation 30
- HP System Software Manager 31
- HP Client Manager 31
- HP Client Foundation Suite 33
- ROM Flash 34
- Remote ROM Flash 35
- HPQFlash 35
- Replicating the Setup 36
- Copying to Multiple Computers 37
- Creating a Bootable Device 38
- Dual-State Power Button 41
- HP Web Site Support 41
- Industry Standards 42
- Asset Tracking and Security 42
- Password Security 44
- Entering a Power-On Password 45
- Entering a Setup Password 45
- DriveLock 47
- Using DriveLock 48
- DriveLock Applications 48
- Smart Cover Sensor 49
- Smart Cover Lock 49
- Cable Lock Provision 50
- Drive Protection System 51
- Surge-Tolerant Power Supply 51
- Thermal Sensor 51
- SATA Hard Drives 53
- SATA Hard Drive Cables 53
- SATA Power Cable 54
- PATA Device Information 55
- ATA SMART Drives 55
- Hard Drive Capacities 55
- Chassis Designations 57
- Generating Static 58
- Grounding the Work Area 59
- Operating Guidelines 61
- Routine Care 61
- Cleaning the Keyboard 62
- Cleaning the Monitor 62
- Service Considerations 63
- Cables and Connectors 64
- Hard Drives 64
- Lithium Coin Cell Battery 64
- — Microtower (MT) Chassis 65
- Access Panel 66
- Front Bezel 67
- Front Drive Bezels 68
- DDR2-SDRAM DIMMs 70
- Installing Memory Modules 70
- Expansion Cards 72
- PCI/PCIe Expansion Card 73
- Cable Management 75
- Cable Connections 76
- Drive Positions 77
- 5.25" Drive 78
- 3.5” Drive 79
- Removing a 3.5” Hard Drive 81
- Power Switch Assembly 83
- Speaker 84
- System Fan 85
- Heatsink 86
- Processor 87
- System Board 89
- Type 1 Battery Holder 91
- Type 2 Battery Holder 92
- Type 3 Battery Holder 93
- Power Supply 94
- A Connector Pin Assignments 95
- Ethernet RJ-45 96
- Ethernet AUI 96
- Parallel Interface 97
- Microphone 98
- Headphone 98
- Line-in Audio 98
- Line-out Audio 98
- External Infrared Transceiver 98
- ENWW Monitor 93 99
- 24-Pin Power 100
- 24-Pin MicroFit Power 101
- 4-Pin Power (for CPU) 101
- 6-Pin Power (for CPU) 101
- SATA Data and Power 102
- PCI Express 102
- DVI Connector 104
- ENWW DVI Connector 99 105
- B Power Cord Set Requirements 107
- C POST Error Messages 109
- Safety and Comfort 119
- Helpful Hints 120
- Solving General Problems 122
- Solving Power Problems 126
- Solving Diskette Problems 127
- Solving Hard Drive Problems 130
- Solving Display Problems 134
- Solving Audio Problems 138
- Solving Printer Problems 140
- Solving Network Problems 145
- Solving Memory Problems 148
- Solving Processor Problems 150
- Cause Solution 153
- Solving Drive Key Problems 154
- Solving Software Problems 158
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