HP E1Z74UT User Manual Page 207
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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).
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.
Red Power LED flashes five
times, once every second,
followed by a two second
pause. Beeps stop after fifth
iteration but LEDs continue until
problem is solved.
5 Pre-video memory error.
CAUTION: To avoid damage to the DIMMs or
the system board, you must unplug the computer
power cord before attempting to reseat, install, or
remove a DIMM module.
1. Reseat DIMMs.
2. Replace DIMMs one at a time to isolate the
faulty module.
3. Replace third-party memory with HP
memory.
4. Replace the system board.
Interpreting POST diagnostic front panel LEDs and audible codes
197
- Maintenance and Service Guide 1
- About This Book 3
- Table of contents 5
- 1 Product features 11
- Small Form Factor (SFF) 12
- Serial number location 17
- Software 18
- Windows 8 19
- Downloading Windows 8 updates 20
- 3 Illustrated parts catalog 21
- Misc parts 24
- Misc boards 26
- Computer major components 30
- Spare part 37
- Description 37
- 732772-001 Solenoid lock 37
- 4 Routine care, SATA drive 38
- Generating static 39
- Grounding the work area 40
- Operating guidelines 41
- Routine care 42
- Service considerations 43
- Cables and connectors 44
- Hard Drives 44
- SATA hard drives 45
- SATA hard drive cables 46
- SMART ATA drives 46
- Cable management 46
- 5 Removal and replacement 47
- Access panel 48
- Front bezel security 49
- Front bezel 50
- Expansion cards 56
- No. Guide Screw Device 62
- Removing a 5.25-inch drive 64
- Installing a 5.25-inch drive 64
- Power switch/LED assembly 78
- Speaker 645330-001 83
- Solenoid lock 641498-001 84
- Fan 636922-001 88
- 6 Removal and replacement 95
- Bezel blanks 100
- DDR3-SDRAM DIMMs 101
- Populating DIMM sockets 101
- Installing DIMMs 102
- Expansion card 104
- System board connections 108
- Drive positions 111
- Removing a 3.5-inch device 112
- Installing a 3.5-inch device 113
- Removing a slim optical drive 115
- Power supply 122
- Fan duct 125
- Description Spare part number 126
- Solenoid lock 732772-001 126
- Hood sensor 129
- Cable routing 130
- Front I/O assembly 131
- Power switch assembly 133
- Speaker 727149-001 135
- Fan sink 136
- Processor 137
- System board 139
- Computer Setup—File 144
- Computer Setup—Storage 145
- Computer Setup—Security 148
- Computer Setup—Power 153
- Computer Setup—Advanced 155
- 8 Troubleshooting without 158
- Helpful hints 159
- Solving general problems 161
- Solving power problems 165
- Solving hard drive problems 166
- Solving display problems 170
- Solving audio problems 176
- Solving printer problems 178
- Solving Network Problems 184
- Solving memory problems 187
- Solving processor problems 189
- Solving software problems 195
- 9 POST error messages 197
- Resetting the password jumper 211
- 11 HP PC Hardware Diagnostics 214
- 12 System backup and recovery 216
- Using Windows 8 Refresh 218
- Using Windows 8 Reset 219
- Creating recovery media 222
- System Restore 225
- System Recovery 226
- A Battery replacement 230
- Smart cover FailSafe key 233
- C Power cord set requirements 236
- Country-specific requirements 237
- D Specifications 238
- SFF specifications 239
- Rated Input Current 4A 240
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