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HP OmniBook 900 Troubleshooting and Diagnostics 3-7
Symptom Call Center:
Suggestions
Repair Center:
Likely Causes
Repair Center:
Comments
White display Adjust display brightness. LCD module.
Motherboard.
Erratic display LCD flex cable or
connections.
LCD module.
Make sure the LCD module
and flex cable have small
foam pads attached—see
page 2-10.
Bright or missing
pixels or lines
See quality statement on
page 5-2.
LCD module.
LCD flex cable or
connections.
See quality statement on
page 5-2.
Hard disk
Hard disk never
spins
Check the power source.
Remove and reinsert the
hard drive. Check the
contacts.
Hard drive or
contacts.
Motherboard.
Hard disk makes
clunking or
scratching noise
Back up the drive
immediately.
Was the computer or drive
dropped?
Hard drive. Check the computer and
drive for evidence of
customer abuse.
Hard disk makes
buzzing or whining
noise
Back up the drive
immediately.
Check for alternate noise
sources, such as a PCMCIA
drive or fan.
If a keystroke causes the
sound to change, it may be
power supply noise.
Depends on the
source of the noise.
For a serial number before
TW92500000, remove the
drive and check whether the
slot has a metal bracket
across the inside top of the
slot. If there is no bracket,
you should install a HDD
bracket and required case
parts. (Service note 900-14.)
Files are corrupted Run a virus scan program.
Check the disk surface by
running Scandisk (Windows
95/98) or Disk Administrator
(Windows NT). Or boot to
DOS and run CHKDSK to
look for problems, run
CHKDSK /f to fix.
Use Recovery CD to restore
original factory software.
Use same suggestions
shown at left.
Drive capacity is
less than normal
Check the disk surface by
running Scandisk (Windows
95/98) or Disk Administrator
(Windows NT).
Check partitions using FDISK
(Windows 95/98) or Disk
Administrator (Windows NT).
Hard drive. Use same suggestions
shown at left.
Recreate the Hibernate
partition (see page 2-8), then
partition and format the disk.
Floppy drive
General problems Check floppy drive contacts.
Try reseating the external
module bay cable and the
module into the bay.
Try using alternate
connection (with accessory
floppy cable or external
module bay).
Check settings in BIOS
Setup.
Floppy drive or
contacts.
Accessory floppy
cable.
External module bay.
Motherboard.