HP 280 G1 Specifications Page 84
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High pitched noise coming from inside a flat panel monitor.
Cause Solution
Brightness and/or contrast settings are too high. Lower brightness and/or contrast settings.
Fuzzy focus; streaking, ghosting, or shadowing effects; horizontal scrolling lines; faint vertical bars; or unable to center the
picture on the screen (flat panel monitors using an analog VGA input connection only).
Cause Solution
Flat panel monitor’s internal digital conversion circuits may be
unable to correctly interpret the output synchronization of the
graphics card.
1. Select the monitor’s Auto-Adjustment option in the
monitor’s on-screen display menu.
2. Manually synchronize the Clock and Clock Phase on-screen
display functions. To download a SoftPaq that will assist
you with the synchronization, go to the following Web site,
select the appropriate monitor, and download either
SP32347 or SP32202:
http://www.hp.com/support
Graphics card is not seated properly or is bad (some models). 1. Reseat the graphics card.
2. Replace the graphics card.
Certain typed symbols do not appear correct.
Cause Solution
The font you are using does not support that particular symbol. Use the Character Map to locate and select the appropriate
symbol. You can copy the symbol from the Character Map into a
document.
In Windows 7, click Start, select All Programs, select
Accessories, select System Tools, and then select Character
Map.
In Windows 8.1, on the Start screen, type ch, and then select
Character Map from the list of applications.
Solving audio problems
If the computer has audio features and you encounter audio problems, see the common causes and solutions
listed in the following table.
Sound cuts in and out.
Cause Solution
Processor resources are being used by other open applications. Shut down all open processor-intensive applications.
76 Chapter 7 Troubleshooting without diagnostics
- Maintenance and Service Guide 1
- Safety warning notice 3
- Table of contents 5
- 1 Product description 9
- 2 Product Features 12
- Front panel components 13
- Rear panel components 14
- Rear panel components 7 15
- Serial Number Location 16
- 3 Illustrated parts catalog 17
- Misc parts 19
- Generating static 21
- Grounding the work area 22
- Operating guidelines 23
- Routine care 24
- Service considerations 25
- Cables and connectors 26
- Hard Drives 26
- Lithium coin cell battery 26
- SATA hard drives 27
- SATA hard drive cables 27
- SMART ATA drives 27
- Cable management 28
- Preparation for disassembly 29
- Access panel 30
- Front bezel 31
- Optical drive bezel blank 32
- DDR3/DDR3L-SDRAM UDIMMs 33
- Populating DIMM sockets 33
- Installing DIMMs 34
- Expansion cards 35
- Drive positions 39
- Removing an optical drive 40
- Removing a hard drive 41
- Card reader 45
- Heat sink 47
- Processor 48
- 7. Remove the speaker 51
- Speaker 43 51
- Rear chassis fan 52
- Rear chassis fan 45 53
- Hood sensor 54
- Power supply 55
- System board 57
- System board callouts 58
- Computer Setup—File 61
- Computer Setup—Storage 62
- Computer Setup—Security 63
- Computer Setup—Power 66
- Computer Setup—Advanced 67
- Safety and comfort 70
- Helpful hints 71
- Solving general problems 72
- Solving general problems 65 73
- Solving general problems 67 75
- Solving power problems 76
- Solving hard drive problems 77
- Solving display problems 80
- Solving display problems 73 81
- Solving display problems 75 83
- Solving audio problems 84
- Solving audio problems 77 85
- Solving printer problems 86
- Solving Network Problems 91
- Solving Network Problems 85 93
- Solving memory problems 94
- Solving software problems 100
- Solving software problems 93 101
- 8 POST error messages 102
- 10 HP PC Hardware Diagnostics 114
- 11 System backup and recovery 116
- Creating recovery media 119
- System Restore 121
- System Recovery 122
- Recommended Applications 125
- A Battery replacement 126
- B Power Cord Set Requirements 128
- Country-Specific Requirements 129
- C Statement of Volatility 130
- D Specifications 132
- ERecycling 133
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