Solving Keyboard/Numeric Keypad Problems; Solving Memory Problems - Compaq Presario 1900 XL1 Maintenance & Service Manual

Troubleshooting Section
Problem
A new device is not recognized as part
of the computer system.

Solving Keyboard/Numeric Keypad Problems

Some common causes and solutions for keyboard/numeric keypad problems are listed in the following table.
Problem
Embedded numeric keypad on computer
keyboard is disabled.
Embedded numeric keypad is disabled and
Num Lock function is on.

Solving Memory Problems

Some common causes and solutions for memory problems are listed in the following table.
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.
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Solving Hardware Installation Problems
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.
Solving Keyboard/Numeric Keypad Problems
Probable Cause
Num Lock function is not enabled.
External numeric keypad is
connected to the computer.
Solving 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.
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)
Press the Shift + NumLk keys to
enable the Num Lock function and
embedded numeric keypad. The
Num Lock icon on the status panel
turns on.
Disconnect the external numeric
keypad from the computer.
Solution(s)
Ensure that the optional memory
expansion card is installed
correctly.
Check the application
documentation for memory
requirements.
Install additional memory.