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Table C-2 Diagnostic Front Panel LEDs and Audible Codes (continued)
Activity Beeps Possible Cause Recommended Action
Red Power LED flashes two
times, once every second,
followed by a two second
pause. Beeps stop after fifth
iteration but LEDs continue
until problem is solved.
2 Processor thermal
protection activated:
A fan may be blocked or
not turning.
OR
The heat sink/fan
assembly 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 heat sink/fan assembly.
4. Contact an authorized reseller or service
provider.
Red Power LED flashes three
times, once every second,
followed by a two second
pause. Beeps stop after fifth
iteration but LEDs continue
until problem is solved.
3 Processor not installed
(not an indicator of bad
processor).
1. Check to see that the processor is present.
2. Reseat the processor.
Red Power LED flashes four
times, once every second,
followed by a two second
pause. Beeps stop after fifth
iteration but LEDs continue
until problem is solved.
4 Power failure (power
supply is overloaded).
OR
The incorrect external
power supply adapter is
being used on the USDT.
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.
OR
The USDT power supply adapter must be at
135W and use the Smart ID technology before
the system will power up. Replace the power
supply adapter with the HP-supplied USDT
power supply adapter.
Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 153
- HP Pro 3330/3380 Microtower 1
- HP Pro 3335/3385 Microtower 1
- HP Pro 3340/3348 Microtower 1
- HP Pro 3330 Small Form Factor 1
- About This Book 3
- Table of contents 5
- 1 Product Features 11
- Feature Overview 12
- Microtower Components 13
- Small Form Factor Components 14
- Software 15
- Protecting the Software 16
- Computer Setup—File 19
- Computer Setup—Storage 20
- Computer Setup—Security 22
- Computer Setup—Power 25
- Computer Setup—Advanced 26
- 4 Illustrated parts catalog 28
- Misc Parts 32
- Misc Boards 33
- Computer major components 36
- SATA Hard Drives 43
- SATA Hard Drive Cables 43
- SMART ATA Drives 44
- Hard Drive Capacities 44
- Preparation 45
- Grounding the Work Area 47
- Operating Guidelines 48
- Routine Care 48
- Cleaning the Keyboard 49
- Cleaning the Monitor 49
- Service Considerations 50
- Cables and Connectors 51
- Hard Drives 51
- Lithium Coin Cell Battery 51
- – Microtower (MT) Chassis 52
- Removing Memory Modules 60
- Expansion Cards 63
- Item Description 64
- PCI1 PCI slot 65
- PCI2 PCI slot 65
- Installing Additional Drives 74
- Drives 65 75
- Removing an Optical Drive 77
- Removing a Hard Drive 80
- Drives 71 81
- Drives 73 83
- Power Switch/LED Assembly 89
- System Fan 91
- Fan Sink Assembly 95
- AMD Sempron processor: 97
- System Board 101
- Preparation for Disassembly 104
- Access Panel 105
- Front Bezel 107
- DDR3-SDRAM DIMMs 108
- Populating DIMM Sockets 109
- Removing DIMMs 110
- Expansion Card 113
- Cable Management 117
- Cable Connections 118
- Drive Positions 119
- Removing Drives 120
- Removing the Hard Drive 122
- Drives 113 123
- Drives 115 125
- Power Switch 126
- Front USB Assembly 128
- Description Spare part number 130
- Speaker 666885-001 130
- Fan Assembly 132
- Fan Assembly 123 133
- Fan Sink 134
- Processor 136
- Power Supply 138
- Power Supply 129 139
- A Connector Pin Assignments 144
- Headphone 145
- Line-in Audio 145
- Line-out Audio 145
- 4-Pin Power (for CPU) 145
- DVI Connector 147
- 24-Pin Power 148
- PCI Express 149
- B Power Cord Set Requirements 151
- Country-Specific Requirements 152
- C POST Error Messages 153
- Audible Codes 162
- Safety and Comfort 166
- Helpful Hints 167
- Solving General Problems 169
- Solving General Problems 161 171
- Solving Power Problems 172
- Solving Diskette Problems 173
- Solving Diskette Problems 165 175
- Solving Hard Drive Problems 176
- Solving Display Problems 181
- Solving Display Problems 173 183
- Solving Audio Problems 185
- Solving Printer Problems 187
- Solving Network Problems 191
- Solving Network Problems 183 193
- Solving Memory Problems 195
- Solving Processor Problems 196
- Solving Software Problems 203
- Contacting Customer Support 204
- Resetting the Password Jumper 206
- F Backup and Recovery 208
- Performing a Recovery 210
- Using F11 211
- G Specifications 213
- SFF Specifications 214
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