Fn problem I have a problem with my laptop ... I want to ask how to fix the problem with the Fn button. When i press F6 the screen goes blank. You should press fn + f6 to happen. I tried the BIOS, but do not appear to config anything related to keyboard / mouse. I tried to keep the fn button for 30 seconds, no results. Excuse my bad English

Unless the backlight has gone bad, try Fn+F5 and Fn+F6 keys to see if your display returns. Fn+F5 toggles to an external screen; Fn+F6 toggles the backlight on and off.

Locate the Fn (Function) key on your keyboard. It may be on the bottom left side with dark blue letters. Locate the two "brightness" keys near the top of the keyboard. These will be in the "F" keys, possibly if F6 and F7. They should have little sun pictures or something similar to indicate brightness. Hold down the Fn key while pressing F7, or whichever "F" key your laptop uses to increase brightness. Tap F7 repeatedly until you reach the desired brightness. Fn must be held down as you continue to tap. Hope this helps.

I solve this using Fn + F6, using a 5536 model. Just press Fn + F6, keep holding it and hit the power button, wait for about 5 or 7 seconds, release the Fn and F6 keys. thank you so much guys!

F1 - Security System

1

Press and hold the "Fn" key on the lower left-hand corner of your Toshiba keyboard.

2

Press the "F1" key to activate the security system.

Your laptop's screen will go blank so others can't see what you are working on or accessing.

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3

Press any key or touch the touchpad to exit the security mode.

F2 - Power Save Mode

4

Press and hold the "Fn" key.

5

Press the "F2" key to activate the Power Save mode and make changes to how your laptop handles operating on battery or AC power.

6

Press "Fn" and the "F2" key again to exit the power save mode.

F3 - Standby Mode

7

Press and hold the "Fn" key.

8

Press the "F3" key to place your laptop in Standby mode.

The Standby dialog box will appear.

9

Verify you want to enter Standby mode. Press the power button on your Toshiba laptop to exit Standby mode.

F4 - Hibernation Mode

10

Press and hold the "Fn" key.

11

Press the "F4" key to activate the Hibernation mode and save whatever documents and files that are open to your hard drive.

12

Verify you want to enter Hibernation mode. Press the power button on your Toshiba laptop to exit Hibernation mode.

F5 - Active Display Device/F6 and F7 - Toshiba LCD Screen Brightness

13

Press and hold the "Fn" key.

14

Press the "F5" key to change your laptop's active display device from the laptop screen to an external monitor.

15

Click on the display configuration you want: displaying on both the laptop and external monitor; only on the laptop; only on the external monitor; or a specific screen resolution.

16

Press and hold "Fn" and "F5" to accept the new display settings. Press and hold "Fn" and "F5" again to return to your laptop's display only.

17

Press and hold the "Fn" key.

18

Press the "F6" key to decrease your laptop's screen brightness. Press the "F7" key to increase the brightness.

F8 - Wireless Connection/Bluetooth

19

Press and hold the "Fn" key.

20

Press the "F8" key to select the wireless Internet or Bluetooth connection you want to use.

21

Press and hold "Fn" and "F8" to make your selection. Release the keys to confirm your selection.

F9 - Touchpad Control

22

Press and hold the "Fn" key.

23

Press the "F9" key to enable your laptop's touchpad.

24

Press and hold "Fn" and "F9" again to disable the touchpad.

F10 and F11 - Numeric Keypad/F12 - Scroll Lock

25

Press and hold the "Fn" key.

26

Press the "F10" key to enable your Toshiba laptop's numeric keypad.

27

Press and hold "Fn" and "F11" to enable the cursor control keys on the numeric keypad.

28

Press and hold the "Fn" and "F10" or "F11" key to disable the numeric keypad or cursor control keys.

29

Press and hold the "Fn" key.

30

Press the "F12" key to lock your cursor on a specific line of text. Press and hold "Fn" and "F12" to turn scroll lock off.

hope this helps

The following applies to Acer Laptops...

If the power indicator is lit but nothing appears on the screen - The computer's power management system automatically blanks the screen to save power. Press any key to turn the display on.
If pressing any key does not turn the display back on, check the following....
1. The brightness level might be too low. Press Fn and the right cursor key to increase brightness level
2. Display device might be set to an external monitor. Press Fn and F5 to toggle to the internal display
3. Backlight might be turned off. Press Fn and F6 to turn on the backlight.
4. If the Sleep indicator is lit, the computer is in Sleep mode. Press & release power button to resume.

The following applies to Acer Laptops. You did not specify the brand of laptop you had. If your laptop is not Acer, the specific keys mentioned may be different and you should adjust accordingly.

If the power indicator is lit but nothing appears on the screen - The computer's power management system automatically blanks the screen to save power. Press any key to turn the display on.
If pressing any key does not turn the display back on, check the following....
1. The brightness level might be too low. Press Fn and the right cursor key to increase brightness level
2. Display device might be set to an external monitor. Press Fn and F5 to toggle to the internal display
3. Backlight might be turned off. Press Fn and F6 to turn on the backlight.
4. If the Sleep indicator is lit, the computer is in Sleep mode. Press & release power button to resume.

To adjust the brightness Fn+F6 to decrease and Fn+F7 to increase.

Screen not working
are you able to hear the windows log in?
if you do but no image, most likelly your video card is ruined. overheated or dropped maybe? don't worry is bad but not that bad, there is a way to fix that by a professional.
take it to a computer repair shop and have them check the video card ask if they have a rework station or someone who may. they have to unsolder about 50 pins at the same time get a new card and solder it again.
sometimes they apply heat to it and it will work again but for just a few days maybe weeks but it goes bad again. so replacement is the best option.
I used to charge about 200 bucks but you may be able to ask for a rebate.
do not take it to a major computer store they would tell you there is no repair so you can go in and get a new computer

FN + F6 Turns the display screen
backlight off to save power.
Press any key to return
Try

Change the settings from the display settings panel. (Right click on the desktop and go to display settings)
You should see 2 monitors graphically represented there. 
You can make the monitor that is greyed out active by right clicking on the monitor, and selecting active.