HP ProDesk 600 G4 Microtower PC User Manual Page 77
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System does not power on and the LEDs on the front of the computer are not ashing.
Cause Solution
2. Remove the expansion cards one at a time until the 5V_aux
light on the system board turns on.
3. Replace the system board.
OR
Press and hold the power button for less than 4 seconds. If the hard
drive LED does not turn on white then:
1. Check that the unit is plugged into a working AC outlet.
2. Open the access panel and check that the power button cable
is properly connected to the system board.
3. Check that the power supply cables are properly connected to
the system board.
4. Check to see if the 5V_aux light on the system board is turned
on. If it is turned on, then replace the power button assembly.
5. If the 5V_aux light on the system board is o, then replace
the power supply.
6. Replace the system board.
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.
Solving power problems 69
- Maintenance and Service Guide 1
- About This Book 3
- Table of contents 5
- 1 Product features 9
- Front panel components 10
- Rear panel components 11
- Non-vPro systems 12
- 2 Illustrated parts catalog 13
- Computer major components 7 15
- Miscellaneous parts 16
- Miscellaneous parts 9 17
- Miscellaneous parts 11 19
- Miscellaneous parts 13 21
- Miscellaneous parts 15 23
- Miscellaneous parts 17 25
- Miscellaneous parts 19 27
- Miscellaneous parts 21 29
- Miscellaneous parts 23 31
- Generating static 32
- Grounding the work area 33
- Operating guidelines 34
- Routine care 35
- Service considerations 36
- SMART ATA drives 37
- Preparation for disassembly 38
- Access panel 39
- Optical drive 40
- Dust lter 41
- Front bezel 42
- Hard drives 43
- Hard drives 37 45
- Drive cage 46
- Hood sensor switch 47
- WLAN module 49
- Solid-state drive 50
- Memory module 51
- Power supply 53
- Fan-sink 54
- Processor 55
- System board 57
- Connector board 59
- Computer Setup–Main 62
- Computer Setup—Security 64
- Computer Setup—Advanced 66
- Safety and comfort 72
- Helpful hints 73
- Solving general problems 74
- Solving general problems 67 75
- Solving power problems 77
- Solving hard drive problems 78
- Solving display problems 81
- Solving display problems 75 83
- Solving audio problems 85
- Solving printer problems 87
- Solving network problems 91
- Solving network problems 85 93
- Solving memory problems 94
- Solving software problems 97
- 10 System backup and recovery 111
- Using Windows tools 113
- Restore and recovery 113
- A Battery replacement 116
- Current BIOS steps 119
- Nonvolatile memory usage 121
- Questions and answers 123
- Using HP Sure Start 124
- C Power cord set requirements 125
- Country-specic requirements 126
- D Specications 127
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