HP E1Z74UT User Manual Page 161
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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Solving general problems
You may be able to easily resolve the general problems described in this section. If a problem persists
and you are unable to resolve it yourself or if you feel uncomfortable about performing the operation,
contact an authorized dealer or reseller.
WARNING! When the computer is plugged into an AC power source, voltage is always applied to
the system board. To reduce the risk of personal injury from electrical shock and/or hot surfaces, be
sure to disconnect the power cord from the wall outlet and allow the internal system components to cool
before touching.
Computer appears locked up and will not turn off when the power button is pressed.
Cause Solution
Software control of the power switch is not functional.
1. Press and hold the power button for at least four seconds
until the computer turns off.
2. Disconnect the power cord from the electrical outlet.
Computer will not respond to keyboard or mouse.
Cause Solution
Computer is in Sleep state. To resume from Sleep state, press the power button.
CAUTION: When attempting to resume from Sleep state,
do not hold down the power button for more than four
seconds. Otherwise, the computer will shut down and you will
lose any unsaved data.
System has locked up. Restart computer.
Computer date and time display is incorrect.
Cause Solution
RTC (real-time clock) battery may need to be replaced.
NOTE: Connecting the computer to a live AC outlet
prolongs the life of the RTC battery.
Reset the date and time under Control Panel (Computer
Setup can also be used to update the RTC date and time). If
the problem persists, replace the RTC battery. See the
Removal and Replacement section for instructions on installing
a new battery, or contact an authorized dealer or reseller for
RTC battery replacement.
To access Control Panel in Windows 7, select Start, and then
select Control Panel.
To access Control Panel in Windows 8, from the Start screen,
type c, and then select Control Panel from the list of
applications.
Solving general problems
151
- 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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