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Before You Begin
Removal Sequence
Product Description
Solving Minor Problems (continued)
Audio
Display
PC card
USB
You can perform a self-test on an external VGA color or monochrome monitor as follows:
1. Turn off the monitor.
2. Turn off the computer.
3. Disconnect the monitor signal cable from the computer.
4. Turn on the monitor and allow it to warm up for one minute.
The display should be white. A narrow black border may also appear on the left and right sides of the display.
Either of these displays indicates that the monitor is working properly.
Problem
Characters on computer
display are dim.
Computer screen is blank and
external monitor displays
information.
Fn+F4 hotkey combination
does not switch between
internal and external displays.
Display is blank and the
Suspend icon is flashing.
Internal display is blank and
the screen on an external
monitor displays information.
Internal display flashes or has
garbled characters when
computer is connected to
external monitor.
This display panel has a
continuous pattern across it
(e.g., a "jailbars" pattern), has
a single color on it, or has
garbled graphics across the
entire panel. This failure is for
patterns across the entire
panel (not just on one section).
Ghost bars extending from
graphics on the display.
A single line, small group of
lines, or block appears on the
display panel. This failure
occurs in only a section of the
display panel.
The light tubes on the edge of
the display panel do not light
up at all and Power-On Self-
Test (POST) completes when
the unit is powered up.*
The light tubes on the edge of
the display panel do not light
up at all and Power-On Self-
Test (POST) does not complete
when the unit is powered up.*
Backlight (brightness) cannot
be adjusted with Fn + F7 (¯ )
or Fn + F8 (- ).*
Contrast cannot be adjusted
with Fn + F5 (¯ ) or Fn + F6
(- ).
* This problem indicates that the backlight or its power circuitry has failed. Since you cannot observe the
POST result on the display panel when the backlight is not functioning, connect the unit to an external
monitor before powering the unit up. If an external monitor is not available, verify that POST completes by
opening and closing the display, listening for the single or double beep, and watching for the LEDs turn on at
the front of the computer.
Problem
Accessing information on the
hard drive is much slower
than usual.
Errors occur after starting
from an additional hard drive.
Hard drive does not work.
System does not recognize a
hard drive.
DriveLock settings cannot be
accessed in Computer Setup.
Problem
Probable Cause
A new device is not
Cable(s) of new external device are
recognized as part of
loose or power cables are unplugged.
the computer system.
Power switch of new external device is
not turned on.
Device is not seated properly.
Problem
Embedded numeric keypad on
computer keyboard is
disabled.
Screen is blank and keyboard
is working.
Problem
Memory count during
Power-On Self-Test (POST)
is incorrect.
"Out of Memory"
message is displayed on
the screen or insufficient
memory error occurs
during operation.
Battery pack
Hard drive
Hardware installation
Power
Modem
Display Problems
Probable Cause
The brightness control is not
set properly.
Computer is in direct light.
You may have a screen
saver or screen blanking
utility installed.
Screen timeout was
initiated.
System initiated Suspend
after a user-defined timeout
expired.
Computer initiated a low
battery Suspend or
Hibernation.
Power Management, which
controls Suspend and
Hibernation, is disabled and
the battery pack has
discharged.
Display was switched to the
external monitor.
Display switch is stuck.
CRT or other display device
is not connected properly.
System is in Suspend mode. Press any key or touch the Touch Pad.
Display function was
switched to the external
monitor.
Using 1024 × 768 or higher
resolution on external
monitor and have toggled
back to internal display,
which supports up to 800 ×
600.
Improper display cable
connections.
Defective display cable.
Defective inverter board.
Defective system board.
Common characteristic of
STN displays.
Defective display panel.
Improper backlight or
display cable connections
Defective inverter board.
Defective display cable.
Defective display panel.
Defective system board.
Defective system board.
Improper display cable
connections.
Defective inverter board.
Defective display cable.
Defective system board.
Improper display cable
connections.
Defective inverter board.
Defective display cable.
Defective system board.
Hard Drive Problems
CAUTION: To prevent loss of information, always maintain an up-to-date
backup of your hard drive at all times, in case of errors or failures.
Probable Cause
Hard drive entered low power state due to timeout
and is now exiting from it.
Hard drive is fragmented/not optimized or has
errors.
Additional hard drive has not been specially
prepared with necessary software.
Hard drive is not seated properly.
The drive is not properly seated.
The drive is damaged.
The drive was inserted while system was on or in
Suspend or Hibernation.
The DriveLock settings are accessible only when
you enter Computer Setup by turning on (not
restarting) the computer.
Hardware Installation Problems
Keyboard Problems
Probable Cause
Num Lock function is not enabled. Press the Fn+NumLk keys to enable the
A screen timeout has been
initiated.
QuickLock/QuickBlank has been
initiated
LCD has been disabled
Memory Problems
Probable Cause
Optional memory expansion card is installed
incorrectly, is incompatible with
the computer, or is defective.
System ran out of memory for the
application.
Too many TSR (terminate-and stay-resident)
applications are running.
Presario 305 Model
Specifications
Troubleshooting
Pin Assignments
Battery gauge
Printer
Solution(s)
Adjust the brightness of the display by pressing
Fn+F10 hotkeys.
Move the computer or adjust the screen.
Press any key to refresh the screen.
Press any key to light the screen.
Press the Suspend Button to exit Suspend.
Replace the battery pack and exit
Suspend or Hibernation.
Connect the computer to an external
power source and exit Suspend or
Hibernation.
Replace the battery pack and turn on the
computer.
Connect the computer to an external
power source.
Press Fn+F4 to display information on the
computer screen; press Fn+F4 again to
display information.
Tap the switch.
Check your connections to ensure that an
external device is connected properly.
Use Fn + F2 to switch between LCD or CRT.
Restart the computer.
Reseat the display cable to the following until
the problem is solved:
1. System board
2. Display assembly
Replace the display assembly.
Replace the display assembly.
Replace the system board.
1. Change the background colors.
2. Adjust the Contrast of the display by using
Fn + F5 (¯ ) or Fn + F6 (- ).
Replace the display assembly.
Replace the display assembly.
Replace the display assembly.
Replace the display assembly.
Replace the display assembly.
Replace the system board.
Replace the system board.
1. Reseat the display cable to the system
board.
2. Replace the display assembly.
Replace the display assembly.
Replace the display assembly.
Replace the system board.
1. Reseat the display cable to the system
board.
2. Replace the display assembly.
Replace the display assembly.
Replace the display assembly.
Replace the system board.
Solutions(s)
Ensure that all cables are properly and
securely connected.
Turn off the computer, turn on the external
device, then turn on the computer to
integrate the device with the computer
system.
Turn off the computer and reinsert the
device.
Solution(s)
Num Lock function and embedded numeric
keypad.
Press any key to refresh the screen.
To enable the keyboard and return your
information to the screen, enter your
power-on password.
Press Fn+F4 to cycle from external
monitor to internal LCD.
Solution(s)
Ensure that the optional memory
expansion card is installed
correctly.
1. Check the application
documentation for memory
requirements.
2. Install additional memory.
Remove from memory any TSR
applications that you do not need.
Parts Catalog
Battery Operations
Index
CD/DVD drive
Keyboard
Touchpad/pointing
device
Solution(s)
Wait for the system to restore the previously
saved data to its state prior to initiating a low
Run ScanDisk and Disk Fragmenter.
Boot from the original hard drive or a specially
prepared hard drive.
Turn off and unplug the computer, remove the
battery pack, and remove and then reinstall
the hard drive.
Remove, then reinsert the drive.
Try using the hard drive in another bay to
verify that the problem is with the drive. Run
ScanDisk on the drive.
Shut down the computer before inserting or
removing a hard drive.
Completely turn off the computer. Turn the
computer back on, then run Computer Setup
by pressing F10 when the blinking cursor light
appears in the upper-right corner of the
screen.
Diskette/diskette
drive
Memory
Infrared
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Table of Contents
Troubleshooting
