Panasonic Toughbook CF-S9KWAZG1M Reference Manual page 154

Troubleshooting (Advanced)
Nothing is displayed on the screen
Check if the power-saving mode is active.
• If the power indicator is lit:
The display is turned off. Press a key with no independent effect, such as Ctrl or Shift.
Do not use a key that may make a selection (Enter, Space, Esc, Y, N, numeric keys, and so on).
• If the power indicator is blinking or is not lit:
The sleep/
Windows 7
Disconnect the external display before checking a disk error (
partitioning software. If you run this software with the external display still connected, in some cases, nothing will be
displayed on the screen. If this occurs, wait until the process is complete and the screen display returns.
The display destination may be set to the external display.
Try changing the display destination by pressing Fn + F3.
If you want to switch the display destination repeatedly by pressing Fn + F3, make sure that the display destination has
switched completely each time before pressing Fn + F3 again.
The screen may become darker. Press Fn + F2 to make the screen brighter.
The screen remains dark, if the computer is resumed through either USB device, wired LAN or wireless LAN.
Press a key with no independent effect, such as Ctrl or Shift.
Do not use a key that may make a selection (Enter, Space, Esc, Y, N, numeric keys, and so on).
When the display is rotated and the screen saver starts, the screen may go black for approximately 1 minute, depending
on the type of screen saver. Change the type of screen saver.
There is an afterimage
Display a different screen.
If the same screen is displayed for a long time, this may leave an afterimage.
The screen becomes disordered
The screen display may become distorted if the resolution or number of colors is changed, or if an external display is
connected or disconnected while the computer is operating. Restart the computer.
Switching between internal and external displays does not work
Windows XP
The display destination cannot be switched while a video such as an MPEG file and a DVD Video are playing. Stop playing
the video before switching the display destination.
standby or hibernation is entered. Slide the power switch.
Windows XP
page 149) or before using commercially available
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