HP 1805 manual Solving Minor Problems

Maintenance & Service Guide

Presario 1800 Series

Models: 1805 and 1810

Home Page Notice Preface Product Description Troubleshooting Illustrated Parts Catalog Removal & Replacement Procedures Specifications Pin Assignments Battery Pack Operations

Solving Minor Problems

Some minor problems and possible solutions are outlined in the following tables. If the problem appears related to a software application, check the documentation provided with the software.

Solving Audio Problems

Some common audio problems and solutions are listed in the following table.

Solving Audio Problems

Problem

Computer does not beep after the Power-On Self-Test (POST).

Probable Cause	Solution(s)
This is typical; it indicates successful	No action is required.
completion of the Power-On Self-Test
(POST).

Solving Battery Pack and Battery Gauge Problems

Some common causes and solutions for battery pack problems are listed in the following table. The "Solving Power Problems" section in this chapter may also be applicable.

Solving Battery Pack and Battery Gauge Problems

Problem	Probable Cause	Solution(s)
Computer won't turn on when battery	Battery pack is discharged.	Connect the computer to an external
pack is inserted and power cord is		power source and charge the battery
unplugged.		pack.
		Replace the battery pack with a fully
		charged battery pack.
		Check the battery connectors on the
		system board to verify they are evenly
		spaced and that they are not bent or
		broken.
Computer is beeping and battery LED	Battery charge is low.	Immediately save any open file(s). Then
icon is blinking.		do any one of the following:
		●	Connect the computer to an
			external power source to charge
			the battery pack.
		●	Turn off the computer or initiate
			Hibernation until you can find
			another power source or charge
			the battery pack.

Computer battery LED icon (front on the Volume is turned down too low. unit) blinks to indicate low battery

condition, but computer does not beep.

Battery LED icon doesn't light and	Battery pack is already charged.
battery pack won't fast charge.

Battery pack was exposed to temperature extremes.

Battery pack is at end of its life.

You have to set the date and time every RTC battery is dead. time you turn on the computer.

Problem	Probable Cause
Battery charge does not last as long	Battery is being exposed to high
as expected.	temperatures or extremely cold
	temperatures.

Adjust the volume.

No action is necessary.

Allow time for the battery pack to return to room temperature.

Replace battery pack. Replace the RTC battery.

Solution(s)

Keep the battery pack within the recommended operating temperature range 50° F to 104° F (10° C to 40° C) or recommended storage range

-4° F to 86° F (-20° C to 30° C ). Recharge the battery pack.

Battery pack is warm to the touch after charging.

Battery pack operating time is far less than the documented average operating time.

Battery has partially self-discharged.	Recharge the battery. Discharge the
	battery completely and then recharge it.
Power management is disabled.	Set a power management level in
	Computer Setup.
An external device or PC Card is draining	Turn off or disconnect external devices
the battery.	when not using them.
Normal warming has occurred due to	No action is required.
charging.
Power management is turned off or	Enable power management in Computer
disabled.	Setup and in Windows Power Properties.

An external device or PC Card is draining the battery.

Battery pack has partially self- discharged.

Battery pack is being exposed to high temperatures or extremely cold temperatures.

Turn off or disconnect external devices when not using them.

Condition the battery pack by fully charging, fully discharging, then fully recharging it.

To maintain the charge, leave battery packs in the computer when it is connected to external power.

If the computer is disconnected from external power for more than two weeks, remove battery packs from the computer to reduce the discharge rate.

Keep the battery pack within the recommended temperature ranges. Operating: 50° F to 104° F

(10° C to 40° C) Storage: -4° F to 86° F (-20° C to 30° C )

Recharge the battery pack.

Solving CD/DVD Drive Problems

Some common causes and solutions for CD/DVD drive problems are listed in the following table.

	Solving CD/DVD Drive Problems
Problem	Probable Cause	Solution(s)

CD/DVD drive cannot read a compact	Compact disc or digital versatile disc
disc or digital versatile disc.	is upside down or is improperly
	inserted in the CD/DVD drive.
	CD is CD Plus or Pregap/Track 0 type.

Open the CD/DVD loading tray, lay the compact disc or digital versatile disc in it (label side up), then close the tray.

Cannot read these type CDs in 24x. Remove the CD.

Solving Diskette and Diskette Drive Problems

Some common causes and solutions for diskette and diskette drive problems are listed in the following table.

Solving Diskette and Diskette Drive Problems

Problem	Probable Cause	Solution(s)
Diskette drive cannot write to a	Diskette is write-protected.	Disable the diskette's write-
diskette.		protect feature or use a
		diskette that is not write-
		protected.
	Computer is writing to	Check the drive letter in the
	the wrong drive.	path statement.
	Not enough space is left	Use another diskette.
	on the diskette.
	Drive error has occurred.	Run Computer Checkup from
		the Compaq Diagnostics
		diskette.
	Diskette is not formatted.	Format the diskette. At
		the system prompt, enter
		FORMAT A:
Diskette drive cannot read a	The wrong type of diskette is	Use the type of diskette
diskette.	being used.	required by the drive.
	Diskette has a bad sector.	Copy files to hard drive or
		another diskette. Reformat bad
		floppy.
	Drive error has occurred.	Run Computer Checkup from
		the Compaq Diagnostics
		diskette.
	Diskette is not	Format the diskette. At the
	formatted.	system prompt, enter
		FORMAT A:
Cannot boot from diskette.	Bootable diskette is not in	Put the bootable diskette in
	drive A.	drive A.
	Diskette Boot has incorrect	Run Computer Setup and set
	setting in Computer Setup.	diskette as first to boot.

Solving Display Problems

This section lists some common causes and solutions for computer display and external monitor problems.

You can perform a monitor self-test on an external VGA color or monochrome monitor by disconnecting the monitor from the computer. To do so, complete the following steps:

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.

	Solving Display Problems
Problem	Probable Cause	Solution(s)
Screen is dim.	Control for brightness (if	Adjust the Brightness of the
	applicable) is not set properly.	display by using Fn + F7 (¯ )
		or
		Fn + F8 (- ).

	Computer screen is in direct
	light.
Screen is blank.	Screen save was initiated by
	Power Management due to
	lack of user activity.

Tilt display or move computer.

Press any key or touch the Touch Pad.

Display has overheated.

Display is blank and the Suspend System is in Suspend mode. icon is flashing.

Internal display is blank and the Display function was switched screen on an external monitor to the external monitor. displays information.

If computer is in direct sunlight, move it and allow it to cool off.

Press any key or touch the Touch Pad.

Use Fn + F2 to switch between LCD or CRT.

Problem

Internal display flashes or has garbled characters when computer is connected to external monitor.

Probable Cause	Solution(s)
Using 1024 × 768 or	Restart the computer.
higher resolution on
external monitor and
have toggled back to
internal display, which
supports up to
800 × 600.

The light tubes on the edge of the display panel	Improper backlight or display	Replace the display assembly.
do not light up at all and Power-On Self-Test	cable connections
(POST) completes when the unit is powered
up.**
	Defective inverter board.	Replace the display assembly.
	Defective display cable.	Replace the display assembly.
	Defective display panel.	Replace the display assembly.
	Defective system board.	Replace the system board.
The light tubes on the edge of the display panel	Defective system board.	Replace the system board.
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	Improper display cable	1. Reseat the display cable to the
Fn + F7 (¯ ) or	connections.	system board.
Fn + F8 (- ).***
		2. Replace the display assembly.

Defective inverter board.

Defective display cable.

Defective system board.

Defective inverter board.

Defective display cable. Defective system board.

Replace the display assembly.

Replace the display assembly.

Replace the system board.

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.

Problem	Probable Cause	Solution(s)
This display panel has a continuous pattern	Improper display cable	Reseat the display cable to the following
across it (e.g., a "jailbars" pattern), has a	connections	until the problem is solved:
single color on it, or has garbled graphics
across the entire panel. This failure is for		1.	System board
patterns across the entire panel (not just on
one section).		2.	Display assembly

Defective display cable. Replace the display assembly.

Defective inverter board. Replace the display assembly.

Defective system board. Replace the system board.

To perform a "self-test" on an external VGA color monitor, complete the following steps: The screen should be

NOTE: 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.

Solving Hard Drive Problems

Some common causes and solutions for hard drive problems are listed in the following table.

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.

	Solving Hard Drive Problems
Problem	Probable Cause
Reading hard drive takes an unusually	System entered Hibernation due to
long time after restarting the computer.	low battery condition and is now
	exiting from it.
Hard drive error occurs.	Hard drive has bad sectors or has
	failed.
Hard drive does not work.	Hard drive is not seated properly.

Solution(s)

Give the system time to restore the previously saved data to its exact state before Hibernation.

Run Computer Checkup.

Turn off and unplug the computer, remove the battery pack, and remove and then reinstall the hard drive.

Solving Hardware Installation Problems

Some common causes and solutions for hardware installation problems are listed in the following table.

Solving Hardware Installation Problems

Problem	Probable Cause	Solutions(s)
A new device is not recognized as Cable(s) of new external		Ensure that all cables are
part of the computer system.	device are loose or	properly and securely
	power cables are unplugged.	connected.
	Power switch of new external	Turn off the computer, turn on
	device is not turned on.	the external device, then turn
		on the computer to integrate
		the device with the computer
		system.
	Device is not seated properly.	Turn off the computer and
		reinsert the device.

Solving Keyboard/Numeric Keypad Problems

Some common causes and solutions for keyboard/numeric keypad problems are listed in the following table.

Solving Keyboard/Numeric Keypad Problems

Problem	Probable Cause	Solution(s)
Embedded numeric keypad on	Num Lock function is not	Press the Shift+NumLk keys
computer keyboard is disabled.	enabled.	to enable the Num Lock
		function and embedded
		numeric keypad. The Num
		Lock icon on the status panel
		turns on.
Embedded numeric keypad is	External numeric keypad is	Disconnect the external
disabled and Num Lock function is	connected to the computer.	numeric keypad from the
on.		computer.

Solving Memory Problems

Some common causes and solutions for memory problems are listed in the following table.

	Solving Memory Problems
Problem	Probable Cause	Solution(s)
Memory count during Power-On Self- Optional memory expansion		Ensure that the optional
Test (POST) is incorrect.	card is installed incorrectly,	memory expansion card is
	is incompatible with	installed correctly.
	the computer, or is defective.

"Out of Memory" message is displayed on the screen or insufficient memory error occurs during operation.

System ran out of

memory for the application.

Too many TSR (terminate- and stay-resident) applications are running.

Check the application documentation for memory requirements.

Install additional memory.

Remove from memory any TSR applications that you do not need.

Solving Minor Problems (continued)