Compaq XL280 Memory Solutions Some causes and solutions for memory problems are listed in the following table.

PRESARIO NOTEBOOK MAINTENANCE AND SERVICE GUIDE 1800 SERIES TROUBLESHOOTING 27
Presario 1800/1800T Series
Models: XL280, XL380, XL381,
and XL390
Keyboard/Numeric Keypad Solutions
Some causes and solutions for keyboard/numeric keypad problems are listed in the
following table.
Memory Solutions
Some causes and solutions for memory problems are listed in the following table.
Keyboard/Numeric Keypad
Problem Probable Cause Solution(s)
Embedded numeric
keypad on Notebook
keyboard is disabled.
Num Lock function is not
enabled.
Press the Shift+NumLk keys to
enable the Num Lock function and
embedded numeric keypad
(Num Lock light à is on).
Embedded numeric
keypad is disabled and
Num Lock function is
on.
External numeric keypad is
connected to the Notebook.
Disconnect the external numeric
keypad from the Notebook.
Memory
Problem Probable Cause Solution(s)
Memory count during
Power-On S elf-Test
(POST) is incorrect.
Optional memory expansion
card is installed incorrectly, is
incompatible with the
Notebook, or is defective.
Ensure that the optional memory
expansion card is installed
correctly, and then restart the
Notebook.
“Out of Memory”
message is displayed
on the screen or
insufficient memory
error occurs during
operation.
System ran out of memory for
the application.
Check the application
documentation for memory
requirements.
If necessary, install additional
memory.
Too m any TSR
(terminate-and-stay-resident)
applications are running.
Remove from memory any TSR
applications you do not need.