compaq presario 900 series User Manual

							2–14Maintenance and Service Guide
Troubleshooting
Flowchart 2.4 - No Power, Part 3
Continued from 
Flowchart 2.3,
No Power, Part 2.
Reseat AC adapter
in computer and
at power source.
Internal or
external AC
adapter? Done
Done
Done Done Power on?
Power on?Power on? Plug directly
into AC outlet.
Power LED
on?
Power outlet
active?Try different
outlet.Replace external
AC adapter.
Replace
power cord.
Y
N
Y
Y Y
Y N
NN
N
External
Internal
Go to
Flowchart 2.5,
No Power,
Part 4.
272638-001.book  Page 14  Thursday, July 25, 2002  4:21 PM 
						

							Troubleshooting
Maintenance and Service Guide2–15
Flowchart 2.5 - No Power, Part 4
Y
N
Continued from 
Flowchart 2.4,
No Power, Part 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*
*Replace these items as a set to prevent 
shorting out among components.
272638-001.book  Page 15  Thursday, July 25, 2002  4:21 PM 
						

							2–16Maintenance and Service Guide
Troubleshooting
Flowchart 2.6 - No Video, Part 1
A
N
Stand-alone
or docking
station? No video.
Replace the following one at a time. Test after each replacement.
1. Cable between notebook and computer display (if applicable)
2. Inverter board (if applicable)
3. Display
4. System board
Internal or
external
display*?Adjust
brightness.Video OK? Done Docking
station
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
Check for bent
pins on cable.
Tr y
another
display.Internal and
external
video OK?Replace
system
board.
YYN N
* To change from internal to 
external display, use the hotkey 
combination.
Y
Go to
Flowchart 2.7,
No Video, Part 2.
272638-001.book  Page 16  Thursday, July 25, 2002  4:21 PM 
						

							Troubleshooting
Maintenance and Service Guide2–17
Flowchart 2.7 - No Video, Part 2
Y
N
Continued from
Flowchart 2.6,
No Video, Part 1.
Done Video OK?
Adjust external
monitor display.Adjust
display
brightness.
Video OK?Video OK?
Done Done
Check that notebook is properly 
seated in docking station, for bent 
pins on cable, and for monitor 
connection.Go to “A” in
Flowchart 2.6,
No Video, Part 1.Check brightness
of external 
monitor.
Try another
external
monitor.
Internal
and external
video OK?
Go to
Flowchart 2.8,
Nonfunctioning
Docking Station.
YY
Y N
N
N
Remove 
notebook from 
docking station, 
if connected.
272638-001.book  Page 17  Thursday, July 25, 2002  4:21 PM 
						

							2–18Maintenance and Service Guide
Troubleshooting
Flowchart 2.8 - Nonfunctioning Docking Station
(if applicable)
Y
N
Reseat power 
cord in docking
station and
power outlet.
N
Replace the following docking station 
components one at a time. Check 
computer operation after each 
replacement.
1. Power supply
2. I/O board
3. Backplane board
4. Switch box
Check voltage 
setting on 
docking station.
Reset monitor 
cable connector at 
docking station.Reinstall 
notebook into 
docking station.
Docking
station
operating?
Docking
station
operating?
Remove 
notebook, reseat 
all internal parts, 
and replace any 
damaged items in 
docking station.DoneDone
Y
Nonfunctioning
docking station.
272638-001.book  Page 18  Thursday, July 25, 2002  4:21 PM 
						

							Troubleshooting
Maintenance and Service Guide2–19
Flowchart 2.9 - No Operating System (OS) Loading
No OS loading
from hard drive,
go to Flowchart 2.10, 
No OS Loading from 
Hard Drive, Part 1.
Reseat power 
cord in docking
station and
power outlet.
No OS
loading.*
* Before beginning troubleshooting, always 
check cable connections, cable ends, and 
drives for bent or damaged pins.
No OS loading
from CD- or
DVD-ROM drive,
go to Flowchart 2.14,
No OS Loading
from CD- or
DVD-ROM Drive.
No OS loading
from diskette drive,
go to Flowchart 2.13, 
No OS Loading from 
Diskette Drive.
272638-001.book  Page 19  Thursday, July 25, 2002  4:21 PM 
						

							2–20Maintenance and Service Guide
Troubleshooting
Flowchart 2.10 - No OS Loading from Hard Drive, Part 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 
from Hard Drive, 
Part 2.
Reseat
external
hard drive.
OS loading?
Done
Boot from
CD?
Go to
Flowchart 2.13,
No OS
Loading from
Diskette Drive.
Boot from
hard drive?
Boot from
diskette?
Change boot
priority through
the setup utility
and reboot.
Boot from
hard drive?
Y Y
Y YY
N N
N N N
Check the setup 
utility for correct 
booting order.
272638-001.book  Page 20  Thursday, July 25, 2002  4:21 PM 
						

							Troubleshooting
Maintenance and Service Guide2–21
Flowchart 2.11 - No OS Loading from Hard Drive, Part 2
Continued from
Flowchart 2.10,
No OS Loading 
from Hard Drive, 
Part 1.
Reseat
hard drive.
Done CD or
diskette in
drive?1. Replace hard 
drive.
2. Replace 
system board.
Go to
Flowchart 2.13,
No OS Loading 
from Diskette 
Drive.
Load OS using 
Restore CD 
(if applicable). Format hard drive 
and bring to a 
bootable C: 
prompt.Create partition, 
then format hard 
drive to bootable 
C: prompt. Remove
diskette and 
reboot.
YN
Boot from
hard drive?
Y
N
YN
Hard drive 
accessible?
YN
Hard drive
accessible?Done
Run FDISK.
Y
N
Hard drive
partitioned?
Hard drive
formatted?
YN
YN
Computer
booted?
Done
Y
N
Go to
Flowchart 2.12,
No OS Loading 
from Hard Drive,
Part 3.Go to
Flowchart 2.12,
No OS Loading 
from Hard Drive,
Part 3. Boot from 
diskette drive?
272638-001.book  Page 21  Thursday, July 25, 2002  4:21 PM 
						

							2–22Maintenance and Service Guide
Troubleshooting
Flowchart 2.12 - No OS Loading from Hard Drive, Part 3
Y
System
files on hard
drive? Continued from 
Flowchart 2.11,
No OS Loading 
from 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 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
sectors.Boot from
hard drive?Replace
hard drive.
Done
272638-001.book  Page 22  Thursday, July 25, 2002  4:21 PM 
						

							Troubleshooting
Maintenance and Service Guide2–23
Flowchart 2.13 - No OS Loading from Diskette Drive
Done
Y
N
Reseat
diskette drive. OS not loading
from
diskette drive.
Done
Y
YY Y
Y
Y Y N
N
N NN
NN
OS
loading?
Nonsystem
disk message?Bootable
diskette
in drive?Install bootable
diskette and
reboot computer.
Check diskette
for system files.
Try different 
diskette.
1. Replace 
diskette drive.
2. Replace 
system board. Nonsystem
disk error?
OS
loading? Boot
from another
device?
Enable drive
and cold boot
computer.
Diskette
drive boot
order?
Change boot
priority using
the setup utility.Go to
Flowchart 2.17,
Nonfunctioning
Device.
Diskette
drive enabled
in the setup 
utility?
Go to
Flowchart 2.17,
Nonfunctioning
Device. Clear CMOS. 
Refer to 
Section 1.3, 
“Clearing a 
Password,” for 
instructions.
272638-001.book  Page 23  Thursday, July 25, 2002  4:21 PM