Toshiba Satellite L455-S1591 Resource Manual page 51

If you are using an AC adaptor, verify that the computer is receiving
power from the external power source by looking at the AC power
light. If the indicator is glowing, the computer is connected to a live
external power source.
The computer starts but when you press a key nothing
happens.
Verify that the active program accepts text input. Try clicking your
mouse on an area where you can type text and try typing again.
Your computer may be in Sleep mode and have a software or
resource conflict. When this happens turning the power on returns
you to the problem instead of restarting the system. To clear the
condition, press
computer via software, or follow the steps if your program stops
responding (see "Problems that are easy to fix" on page 49).
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
and
Fn 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
Fn and F5
previous setting.
Ctrl , Alt , and
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.
If something goes wrong
Del simultaneously. Then shut down the
+ to turn off the cursor control
Fn F10
to turn off the numlock light.
Enter
key and pressing the
. If no password is
and
Fn F5
key several times will
F5
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