HP Pro All-in-One 3520 Specifications Page 145
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Activity Beeps Possible Cause Recommended Action
Red Power LED flashes six
times, once every second,
followed by a two second
pause. Beeps stop after fifth
iteration but LEDs continue
until problem is solved.
6 Pre-video graphics error. For systems with a graphics card:
1. Reseat the graphics card.
2. Replace the graphics card.
3. Replace the system board.
For systems with integrated graphics, replace
the system board.
Red Power LED flashes
seven times, once every
second, followed by a two
second pause. Beeps stop
after fifth iteration but LEDs
continue until problem is
solved.
7 System board failure
(ROM detected failure
prior to video).
Replace the system board.
Red Power LED flashes eight
times, once every second,
followed by a two second
pause. Beeps stop after fifth
iteration but LEDs continue
until problem is solved.
8 Invalid ROM based on
bad checksum.
1. Reflash the system ROM with the latest
BIOS image.
2. Replace the system board.
Red Power LED flashes nine
times, once every second,
followed by a two second
pause. Beeps stop after fifth
iteration but LEDs continue
until problem is solved.
9 System powers on but is
unable to boot.
1. Unplug the AC power cord from the
computer, wait 30 seconds, then plug the
power cord back in to the computer.
2. Replace the system board.
3. Replace the processor.
Red Power LED flashes ten
times, once every second,
followed by a two second
pause. Beeps stop after fifth
iteration but LEDs continue
until problem is solved.
10 Bad option card. 1. Check each option card by removing the
card (one at a time if multiple cards), then
power on the system to see if fault goes
away.
2. Once a bad card is identified, remove and
replace the bad option card.
3. Replace the system board.
Red Power LED flashes
eleven times, once every
second, followed by a two
second pause. Beeps stop
after fifth iteration but LEDs
continue until problem is
solved.
11 The current processor
does not support a
feature previously
enabled on this system.
1. Install a TXT capable processor.
2. Disable TXT in the Computer Setup (F10)
utility.
3. Reinstall the original processor.
Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 137
- About This Book 3
- Table of contents 5
- 1 Product Features 9
- Front Components 10
- Side Components 11
- Rear Components 12
- Software 13
- Downloading Windows 8 updates 14
- SATA Hard Drives 15
- SATA Hard Drive Cables 15
- SMART ATA Drives 16
- Hard Drive Capacities 16
- Preparation 17
- Grounding the Work Area 19
- Operating Guidelines 20
- Routine Care 20
- Cleaning the Keyboard 21
- Cleaning the Monitor 21
- Service Considerations 22
- Hard Drives 23
- Lithium Coin Cell Battery 23
- Computer Setup—File 26
- Computer Setup—Storage 27
- Computer Setup—Security 30
- Computer Setup—Power 34
- Computer Setup—Advanced 35
- 6 Illustrated parts catalog 38
- Cables 31 39
- Boards 33 41
- Misc Parts 42
- Thermal pads 43
- All-in One (AIO) Chassis 48
- Rear Cover 49
- Description Spare part number 50
- Stand 709838-001 50
- Stand 43 51
- Memory Cover 52
- Memory Cover 45 53
- 4 GB (PC3-12800) 689373-001 54
- 2 GB (PC3-12800) 689372-001 54
- RTC Battery 56
- RTC Battery 49 57
- Optical Drive 58
- Optical Drive 51 59
- Hard Drive 60
- Converter Board 62
- Speakers 64
- Speakers 57 65
- Webcam Module 66
- Webcam Module 59 67
- System Board Cover 69
- Fan 671582-001 71
- Heat sink/thermal module 73
- Processor 75
- Drive Cables and Connector 77
- WLAN Module 79
- System Board 82
- System Board 75 83
- Front Bezel 85
- Display Panel 87
- Safety and Comfort 90
- Helpful Hints 91
- Solving General Problems 93
- Solving General Problems 87 95
- Solving Power Problems 97
- Solving Hard Drive Problems 99
- Solving Display Problems 104
- Solving Display Problems 97 105
- Solving Display Problems 99 107
- Solving Audio Problems 109
- Solving Printer Problems 111
- Solving Network Problems 117
- Solving Network Problems 111 119
- Solving Memory Problems 120
- Solving Memory Problems 113 121
- Solving Processor Problems 122
- Solving Software Problems 128
- Solving Software Problems 121 129
- Contacting Customer Support 130
- B HP PC Hardware Diagnostics 131
- Backing up your information 133
- Performing a system recovery 134
- Using f11 recovery tools 135
- D POST Error Messages 137
- Audible Codes 143
- E Power Cord Set Requirements 147
- Country-Specific Requirements 148
- F Specifications 149
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