Toshiba 1805 - Manual (Page 210)

210 If Something Goes Wrong
Resolving a hardware conflict
You have connected an external keyboard and you get one or
more keyboard error messages.
If you have a second keyboard, try it. If it works, the first keyboard
may be defective or incompatible with your computer.
Nothing happens when you press the keys on the external
keyboard.
You may have plugged the external PS/2 keyboard in while the
computer was turned on. Using the TouchPad, click Start, then
click Turn Off Computer. In the Shut down Windows dialog
box, select Restart and click OK. The computer will restart and
recognize the device.
The keyboard locks and the computer will not restart.
Make sure the power is on and press the Turn Off Computer
button. Then press the power button again to turn on the computer.
Display problems
Here are some typical display problems and their solutions:
The display 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 simultaneously. If you have registered a password, press
Enter , type your password, then press Enter . If no password is
registered, press Enter . 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
Fn and F5
simultaneously (once). If this does not correct the problem, press
Fn and F5 simultaneously again to return the display priority to its
previous setting.