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HP Compaq dc7800 User Manual

HP Compaq dc7800
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Blank screen and the power LED flashes Red five times, once every second, followed by a two second pause, and the
computer beeps five times. (Beeps stop after fifth iteration but LEDs continue flashing.)
Cause
Solution
Pre-video memory error. 1. Reseat DIMMs. Power on the system.
2. Replace DIMMs one at a time to isolate the faulty module.
3. Replace third-party memory with HP memory.
4. Replace the system board.
Blank screen and the power LED flashes Red six times, once every second, followed by a two second pause, and the
computer beeps six times. (Beeps stop after fifth iteration but LEDs continue flashing.)
Cause
Solution
Pre-video graphics error. For systems with a graphics card:
1. Reseat the graphics card. Power on the system.
2. Replace the graphics card.
3. Replace the system board.
For systems with integrated graphics, replace the system
board.
Blank screen and the power LED flashes Red seven times, once every second, followed by a two second pause, and
the computer beeps seven times. (Beeps stop after fifth iteration but LEDs continue flashing.)
Cause
Solution
System board failure (ROM detected failure prior to video). Replace the system board.
Monitor does not function properly when used with energy saver features.
Cause Solution
Monitor without energy saver capabilities is being used with
energy saver features enabled.
Disable monitor energy saver feature.
Dim characters.
Cause
Solution
The brightness and contrast controls are not set properly. Adjust the monitor brightness and contrast controls.
Cables are not properly connected. Check that the graphics cable is securely connected to the
graphics card and the monitor.
Table D-6 Solving Display Problems (continued)
Solving Display Problems 231

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HP Compaq dc7800 Specifications

General IconGeneral
Tcase73.3 °C
Bus typeFSB
SteppingM0
Processor cache2 MB
Processor cores2
Processor modelE4600
System bus rate- GT/s
Processor familyIntel® Core™2 Duo
Processor seriesIntel Core 2 Duo E4000 Series
Processor socketLGA 775 (Socket T)
Processor codenameConroe
Processing Die size111 mm²
Processor frequency2.4 GHz
Processor cache typeL2
Processor lithography65 nm
Processor manufacturerIntel
Processor front side bus800 MHz
Processor operating modes64-bit
ECC supported by processorNo
Thermal Design Power (TDP)65 W
CPU multiplier (bus/core ratio)12
Number of Processing Die Transistors167 M
Internal memory1 GB
Internal memory typeDDR2-SDRAM
Maximum internal memory8 GB
Memory layout (slots x size)2 x 0.5 GB
HDD speed7200 RPM
HDD interfaceSATA
Optical drive typeDVD Super Multi
Total storage capacity160 GB
Audio input1
LightScribeYes
Networking featuresIntel 82566DM Gigabit Network Connection
Graphics card RAMDAC400 MHz
Storage drive controllerSATA 3, 0 Gb/s NCQ SMART VI
Discrete graphics card modelIntel® GMA 3100
Maximum graphics card memory0.256 GB
Operating system installedWindows Vista Business
USB 2.0 ports quantity8
Chassis typeMini Tower
Country of originChina
Cable lock slot typeKensington
Operating altitude0 - 3048 m
Non-operating altitude0 - 9144 m
Storage temperature (T-T)-30 - 60 °C
Operating temperature (T-T)10 - 35 °C
Storage relative humidity (H-H)5 - 95 %
Operating relative humidity (H-H)10 - 90 %
Power supply365 W
Product typePC
Processor codeSLA94
Processor ARK ID32242
Processor package size37.5 x 37.5 mm
Weight and Dimensions IconWeight and Dimensions
Depth452 mm
Width177 mm
Height447 mm
Weight11800 g

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