Specifications

24 T
ROUBLESHOOTING
P
RESARIO
N
OTEBOOK
M
AINTENANCE AND
S
ERVICE
G
UIDE
1400 S
ERIES
Presario 1400 Series
Models: XL240, XL241, XL242, XL244, XL245, XL246, XL247, XL250, XL340,
XL341, XL342, XL343, XL344, XL345, XL346, XL350, XL352, XL355, and XL356
Solving Display Problems
This section lists some causes and solutions for common Notebook 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 Notebook. To do so, complete the following steps:
1. Turn off the monitor.
2. Turn off the Notebook.
3. Disconnect the monitor signal cable from the Notebook.
4. Turn on the monitor and allow it to warm up for one minute.
The display should appear white. On the left and right sides of the screen, a narrow black border
may also be present. If the display screen indicates either of these patterns, the monitor is working
properly.
Solving Display Problems
Problem Probable Cause Solution
Screen is dim. Brightness control is set too
low.
Adjust the Brightness of the display by using
Fn+F7 or Fn+F8.
Notebook screen is in direct
light.
Tilt display or move Notebook.
Screen is blank. Screen save was initiated by
Power Management due to
lack of user activity.
Press any key or touch the TouchPad.
Display has overheated. If the Notebook is in direct sunlight, move it to
shaded area and allow it to cool off.
Display is blank and the
Suspend icon is
flashing.
System is in Suspend mode. Press any key or touch the TouchPad.
Internal display is
blank, but the screen on
an external monitor
displays information.
Display function was switched
to the external monitor.
Use Fn+F3 to switch between LCD or CRT.
Internal display flashes
or has garbled
characters when the
Notebook is connected
to an external monitor.
Used 1024 x 768 or higher
resolution on external monitor
and toggled back to internal
display, which supports up to
800 x 600.
Restart the Notebook.
Continued