HP Pavilion Dv9400 Entertainment Notebook Pc Series Service Guide

Troubleshooting
Maintenance and Service Guide 2–21
Flowchart 2.5—No Power, Part 4
Y
N
Continued from“Flowchart 
2.4—No Power, 
Par t 3.”
Reseat loose
components and
boards and 
replace damaged 
items. Open
computer.
Loose or
damaged
parts?
Y
Close
computer and
retest.
Power on?
Done
N
Replace the following items (if applicable). Check 
computer operation after each replacement:
1. Internal DC-DC converter*
2. Internal AC adapter
3. Processor board*
4. System board*
*NOTE: Replace these items as a set to...

2–22 Maintenance and Service Guide
Troubleshooting
Flowchart 2.6—No Video, Part 1
AN
Stand-alone
or docking 
device? No video.
Replace the following one at a time. Test after each replacement.
1. Cable between computer and computer display (if applicable)
2. Display
3. System board
Internal or
external
display*?Adjust
brightness.Video OK? Done Docking Device
Internal
Stand-alone
External
Adjust
brightness.
Video OK? Done
Y
Press lid
switch to ensure
operation.
Video OK? Done
Y
N
Video OK?
DoneDone
N...

Troubleshooting
Maintenance and Service Guide 2–23
Flowchart 2.7—No Video, Part 2
Y
N
Continued from“Flowchart 
2.6—No Video, 
Par t 1.”
Done
Adjust external
monitor display.Video OK?Adjust
display
brightness.
Video OK?Video OK?
DoneDone
Check that computer is properly
seated in docking device,
for bent pins on cable,
and for monitor connection.Go to “A” in
“Flowchart 
2.6—No Video, 
Par t 1.”
Check brightness
of external
monitor.
Try another
external
monitor.
Internal
and external
video OK?
Go to...

2–24 Maintenance and Service Guide
Troubleshooting
Flowchart 2.8—Nonfunctioning Docking Device
(if applicable)
Y
N
Reseat power 
cord in docking 
device and
power outlet.
N
Check voltage
setting on docking 
device.
Reset monitor
cable connector at
docking device.Reinstall
computer into 
docking device.
Docking 
device
operating?
Docking 
device
operating?DoneDone
Y
Nonfunctioning
docking device.
Remove computer, 
replace docking 
device.
Test replacement 
docking device with 
new computer. 

Troubleshooting
Maintenance and Service Guide 2–25
Flowchart 2.9—No Operating System (OS) 
Loading
No OS loading from hard drive,
go to “Flowchart 2.10—No OS Loading, 
Hard Drive, Part 1.”
Reseat power
cord in docking 
device and
power outlet.
No OS
loading.*
*NOTE: Before beginning troubleshooting, always 
check cable connections, cable ends, and drives 
for bent or damaged pins.
No OS loading from diskette drive,
go to “Flowchart 2.13—No OS Loading, 
Diskette Drive.”
No OS loading from optical drive,...

2–26 Maintenance and Service Guide
Troubleshooting
Flowchart 2.10—No OS Loading, Hard Drive, 
Par t 1
Go to“Flowchart 
2.17—Nonfunctioning 
Device.”
Y
Done
N
OS not
loading from
hard drive.
Nonsystem
disk message?Go to
“Flowchart 
2.11—No OS 
Loading, 
Hard Drive, Part 2.”
Reseat
external
hard drive.
OS loading?
Done
Boot
from
CD?
Go to
“Flowchart 
2.13—No OS 
Loading, 
Diskette Drive.”
Boot
from
hard drive?
Boot
from
diskette?
Change boot
priority through
the Setup Utility
and reboot.
Boot
from
hard...

Troubleshooting
Maintenance and Service Guide 2–27
Flowchart 2.11—No OS Loading, Hard Drive, 
Par t 2
Load OS using 
Operating System disc 
(if applicable). Continued from
“Flowchart 
2.10—No OS 
Loading, 
Hard Drive, Part 1.”
Reseat
hard drive.
Done Disc or
diskette in
drive?1. Replace 
hard drive.
2. Replace system 
board.
Go to
“Flowchart 
2.13—No OS 
Loading, 
Diskette Drive.”Format hard drive
and bring to
a bootable
C:\ prompt. Create partition, 
and then format 
hard drive to 
bootable
C:\ prompt....

2–28 Maintenance and Service Guide
Troubleshooting
Flowchart 2.12—No OS Loading, Hard Drive, 
Par t 3
Y
System
files on hard
drive? Continued from
“Flowchart 
2.11—No OS 
Loading, 
Hard Drive, Part 2.”
Clean virus.
Done
N
Install OS
and reboot.
Virus
on 
hard drive?OS
loading from
hard drive?
Y
NY
N
Y
N
Diagnostics on 
disc or diskette?Replace
hard drive.
Run diagnostics
and follow
recommendations. Run SCANDISK and 
check for
bad sectors.
Can bad
sectors
be fixed?Replace
hard drive.
YN
YN
Fix bad...

Troubleshooting
Maintenance and Service Guide 2–29
Flowchart 2.13—No OS Loading, Diskette Drive
Replace the following 
components 
individually, retesting 
after each 
replacement:
■Diskette drive■System board
Done
Y
N
Reseat
diskette drive. OS not loading
from
diskette drive.
Done
Y
YY Y
Y
Y Y
N
N
N
N
N
NN
OS
loading?
Nonsystem
disk message?Bootable
diskette
in drive?Install bootable
diskette and
reboot computer.
Check diskette
for system files.
Try different
diskette.
Nonsystem
disk error?
OS
loading?...

2–30 Maintenance and Service Guide
Troubleshooting
Flowchart 2.14—No OS Loading, Optical Drive
Y
Done
N
Bootable
disc in
drive? Disc
in drive? No OS
loading from
CD-ROM or
DVD-ROM drive.Install bootable
disc and
reboot
computer.
Go to
“Flowchart 
2.17—Nonfunctioning 
Device.”
Go to“Flowchart 
2.17—Nonfunctioning 
Device.”
Install
bootable disc.
Boots from
CD or DVD?
Boots from
CD or DVD?Try another
bootable disc.
Booting
from another
device?
Booting
order
correct?
Correct boot
order using
the Setup...