Presario 305 Model
Before You Begin |
| Specifications |
| Parts Catalog |
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Removal Sequence |
| Troubleshooting |
| Battery Operations |
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| Index |
Product Description |
| Pin Assignments |
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Solving Minor Problems (continued)
Audio | Battery pack | Battery gauge | CD/DVD drive | Diskette/diskette | |
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Display | Hard drive | Hardware installation | Keyboard | Memory | |
PC card | Power | Printer | Touchpad/pointing | Infrared | |
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USB | Modem |
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Display Problems
You can perform a
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 | Probable Cause |
Characters on computer | The brightness control is not |
display are dim. | 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
Computer initiated a low battery Suspend or Hibernation.
Power Management, which controls Suspend and Hibernation, is disabled and the battery pack has discharged.
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.
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.
Display was switched to the | Press Fn+F4 to display information on the |
external monitor. | computer screen; press Fn+F4 again to |
| display information. |
Display switch is stuck. | Tap the switch. |
CRT or other display device | Check your connections to ensure that an |
is not connected properly. | external device is connected properly. |
System is in Suspend mode. | Press any key or touch the Touch Pad. |
Display function was | Use Fn + F2 to switch between LCD or CRT. |
switched to the external |
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monitor. |
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Using 1024 × 768 or higher | Restart the computer. |
resolution on external |
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monitor and have toggled |
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back to internal display, |
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which supports up to 800 × |
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600. |
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This display panel has a | Improper display cable |
continuous pattern across it | connections. |
(e.g., a "jailbars" pattern), has |
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a single color on it, or has |
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garbled graphics across the |
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entire panel. This failure is for |
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patterns across the entire |
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panel (not just on one section). 
Defective display cable.
| Defective inverter board. |
| Defective system board. |
Ghost bars extending from | Common characteristic of |
graphics on the display. | STN displays. |
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 (- ).
A single line, small group of | Defective display panel. | Replace the display assembly. |
lines, or block appears on the |
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display panel. This failure |
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occurs in only a section of the |
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display panel. |
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The light tubes on the edge of the display panel do not light up at all and
The light tubes on the edge of the display panel do not light up at all and
Backlight (brightness) cannot be adjusted with Fn + F7 (¯ ) or Fn + F8 (- ).*
Contrast cannot be adjusted with Fn + F5 (¯ ) or Fn + F6 (- ).
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.
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.
*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.
Hard Drive Problems
CAUTION: To prevent loss of information, always maintain an
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.
Probable Cause | Solution(s) |
Hard drive entered low power state due to timeout | Wait for the system to restore the previously |
and is now exiting from it. | saved data to its state prior to initiating a low |
Hard drive is fragmented/not optimized or has | Run ScanDisk and Disk Fragmenter. |
errors. |
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Additional hard drive has not been specially | Boot from the original hard drive or a specially |
prepared with necessary software. | prepared hard drive. |
Hard drive is not seated properly. | Turn off and unplug the computer, remove the |
| battery pack, and remove and then reinstall |
| the hard drive. |
System does not recognize a hard drive.
DriveLock settings cannot be accessed in Computer Setup.
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.
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
Hardware Installation Problems
Problem
A new device is not recognized as part of the computer system.
Probable Cause
Cable(s) of new external device are loose or power cables are unplugged.
Power switch of new external device is not turned on.
Device is not seated properly.
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.
Keyboard Problems
Problem | Probable Cause | Solution(s) |
Embedded numeric keypad on Num Lock function is not enabled. computer keyboard is
disabled.
Press the Fn+NumLk keys to enable the Num Lock function and embedded numeric keypad.
Screen is blank and keyboard is working.
A screen timeout has been initiated.
Press any key to refresh the screen.
QuickLock/QuickBlank has been | To enable the keyboard and return your |
initiated | information to the screen, enter your |
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LCD has been disabled | Press Fn+F4 to cycle from external |
| monitor to internal LCD. |
Memory Problems
Problem | Probable Cause |
Memory count during | Optional memory expansion card is installed |
incorrectly, is incompatible with | |
is incorrect. | the computer, or is defective. |
"Out of Memory" | System ran out of memory for the |
message is displayed on | application. |
the screen or insufficient |
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memory error occurs |
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during operation. |
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| Too many TSR |
| applications are running. |
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.
