Toshiba Satellite L640-BT2N13 Resource Manual page 34

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If something goes wrong
The keyboard produces unexpected characters.
A keypad overlay may be on. If the numlock light or cursor control
overlay light is on, press
overlay light, or
If the problem occurs when both the keypad overlays are off, make
sure the software you are using is not remapping the keyboard.
Refer to the software documentation and check that the program
does not assign different meanings to any of the keys.
Display problems
Here are some typical display problems and their solutions:
The screen is blank.
Display Auto Off may have gone into effect. Press any key to
activate the screen.
You may have activated the instant password feature by pressing
Fn and F1
any key, type the password and press
registered, press any key. The screen reactivates and allows you to
continue working.
If you are using the built-in screen, make sure the display priority is
not set for an external monitor. To do this, press
simultaneously (once). If this does not correct the problem, press
and
Fn F5
previous setting.
If you are using an external monitor:
Check that the monitor is turned on.
Check that the monitor's power cord/cable is firmly plugged
into a working power outlet.
Check that the cable connecting the external monitor to the
computer is firmly attached.
Try adjusting the contrast and brightness controls on the
external monitor.
Press
priority is not set for the built-in screen.
to turn off the numlock light.
Fn + F11
simultaneously. If you have registered a password, press
simultaneously again to return the display priority to its
HINT: Holding the
Fn
advance you through the display options.
and simultaneously to make sure the display
Fn F5
Fn + F10 to turn off the cursor control
Enter
key and pressing the
. If no password is
and
Fn F5
key several times will
F5