HP EliteDesk 800 G4 Base Model Small Form Factor PC User Manual Page 93
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- Table of contents
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Solving power problems
Common causes and solutions for power problems are listed in the following table.
Power supply shuts down intermittently.
Cause Solution
If equipped with a voltage selector, 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 o automatically and the Power LED ashes Red two times, once every second, followed by a two second
pause, and the computer beeps two times. (Beeps stop after fth iteration but LEDs continue ashing.)
Computer powered o automatically and the Power LED ashes red four times and then white two times.
Cause Solution
Processor thermal protection activated:
A fan may be blocked or not turning.
OR
The heat sink 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 the access panel, press the power button, and see if
the processor fan (or other system fan) spins. If the fan does
not spin, make sure the fan cable is plugged onto the system
board header.
3. If fan a plugged in and not spinning, replace it.
Power LED ashes Red four times, once every second, followed by a two second pause, and the computer beeps four times. (Beeps
stop after fth iteration but LEDs continue ashing.)
Computer powered o automatically and the Power LED ashes red three times and then white four times.
Cause Solution
Power failure (power supply is overloaded). 1. If equipped with a voltage selector, 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 access panel and ensure the 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 drives or optical drives and
expansion cards). Power on the system. If the system enters
POST, then power o 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.
Solving power problems 85
- Maintenance and Service Guide 1
- Safety warning notice 3
- Table of contents 5
- 1 Product features 9
- Front panel components 10
- Rear panel components 11
- Serial number location 11
- 2 Illustrated parts catalog 12
- Computer major components 5 13
- Miscellaneous parts 15
- Generating static 17
- Grounding the work area 18
- Operating guidelines 19
- Routine care 20
- Service considerations 21
- Cables and connectors 22
- Hard Drives 22
- Lithium coin cell battery 22
- SATA hard drives 23
- SATA data cable 23
- SMART ATA drives 23
- Cable management 24
- Preparation for disassembly 25
- Access panel 26
- Front bezel 27
- Front bezel dust lter 29
- System board connections 30
- Populating DIMM sockets 31
- Removing and installing DIMMs 32
- Expansion card 34
- Expansion card 27 35
- Drive positions 38
- Drives 35 43
- Drives 37 45
- Drive cage 48
- WLAN module 54
- Hood lock 55
- Card reader 56
- Antennas 57
- Air duct 59
- Option board 60
- Optional rear port 61
- Fan sink 62
- Up to 65 W processor models 63
- 95 W processor models 63
- Fan sink 55 63
- Processor 66
- Power supply 67
- System board 69
- System board callouts 72
- Computer Setup–Main 76
- Computer Setup—Security 78
- Computer Setup—Advanced 81
- Computer Setup—UEFI Drivers 86
- Safety and comfort 87
- Helpful hints 88
- Solving general problems 89
- Solving general problems 83 91
- Solving power problems 93
- Solving hard drive problems 94
- Solving display problems 97
- Solving display problems 91 99
- Solving audio problems 101
- Solving printer problems 103
- Solving network problems 106
- Solving network problems 99 107
- Solving memory problems 109
- Solving software problems 114
- Resetting the password jumper 122
- A Battery replacement 130
- B Power cord set requirements 133
- Country-Specic Requirements 134
- Nonvolatile memory usage 137
- Questions and answers 139
- D Specications 141
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