@ key does not function with an @

The purpose of a laptop's function key is to activate the secondary function of any dual-purpose key.

The function key can accidentally be locked into place if you hit the wrong combination of keys so that all of the keys only perform their secondary function.

The exact process for unlocking the function key will vary depending on the make and model of your laptop and whether you have recently used an external keyboard.

1
Check the manual that came with your laptop and locate the section on the function of each keyboard key.

Open a Web browser and navigate to the support section of the laptop manufacturer's website if you do not have the manual that originally came with your laptop.

Use the drop-down menus on the support page to choose the specific product line and then model of your laptop.
2

Click on the "Product Support" link and then navigate to the "Manuals" section of the page. Click on the link to open a PDF version of the manual for your laptop.

Browse down to the section about the functions of the keyboard keys.
3

Find the sequence of keys you need to press to unlock the function key on your laptop.
Press and hold the function key on the keyboard and then press the other keys required to unlock it.
4

Try using the most standard keyboard combinations if you don't have the manual or it does not give any information about the function key.

Press the function key and then the shift key and see if it successfully unlocks the function key. Attempt using the other standard keys in conjunction with the function key, such as the "F11," "F12" and "Ctrl" keys.
5

Plug a USB keyboard into the USB port on your laptop if you have recently used an external keyboard with the laptop.

Check the light above the "Numlock" key on the external keyboard and see if it is turned on. Press the key and make sure the light is turned off and then remove the keyboard to unlock the function key.

http://us.acer.com/ac/en/US/content/support
Acer Support

If those are the only keys on the key board that are not responding, I would try to
1. boot in safe mode and check response. If you have other keys on the laptop that are not working,
2. I would boot operating system from a flash drive and check

and if both still are not working for you
3.try an external key board

Last replace the key board

Hope this helps

Step 1:
The purpose of a laptop's function key is to activate the secondary function of any dual-purpose key. The function key can accidentally be locked into place if you hit the wrong combination of keys so that all of the keys only perform their secondary function. The exact process for unlocking the function key will vary depending on the make and model of your laptop and whether you have recently used an external keyboard.

Check the manual that came with your laptop and locate the section on the function of each keyboard key. Open a Web browser and navigate to the support section of the laptop manufacturer's website if you do not have the manual that originally came with your laptop. Use the drop-down menus on the support page to choose the specific product line and then model of your laptop. Click on the "Product Support" link and then navigate to the "Manuals" section of the page. Click on the link to open a PDF version of the manual for your laptop. Browse down to the section about the functions of the keyboard keys. Find the sequence of keys you need to press to unlock the function key on your laptop. Press and hold the function key on the keyboard and then press the other keys required to unlock it. Try using the most standard keyboard combinations if you don't have the manual or it does not give any information about the function key. Press the function key and then the shift key and see if it successfully unlocks the function key. Attempt using the other standard keys in conjunction with the function key, such as the "F11," "F12" and "Ctrl" keys. Plug a USB keyboard into the USB port on your laptop if you have recently used an external keyboard with the laptop. Check the light above the "Numlock" key on the external keyboard and see if it is turned on. Press the key and make sure the light is turned off and then remove the keyboard to unlock the function key.
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Because you have a multimedia keyboard, there are additional functions for those special function keys. The icons on the keys will tell you if they do something special (like play sounds, increase the volume, etc) This kind of keyboard is designed for those who play DVDs and CDs and don't want to have to open a menu on the screen to quickly play music, etc.

if it not manufactured with the function button i think you can't use another kays as a function keys

best regards

Well you need to remove rthe keyboard and make sure it's dry ar the connector end wipe off all screwdriver residue and re-install the keyboard. If it still does not work correctly then you will have to replace the keyboard.

(FuNction key) A keyboard key that works like a shift key to activate a second function on a dual-purpose key. Commonly found on laptop keyboards, the Fn key is often used to control hardware functions such as screen brightness and speaker volume. The Fn key may also be found on extra small keyboards for desktop computers, typically for Page Up and Page Down, which are combined with Up Arrow and Down Arrow. See function key.

in that case Keyboard lose connection that why its happen please reattached keyboard again

there is a key combination that enables/disables the touch pad. it's the Fn key + the function key that shows a little mouse icon in blue at the top of your keyboard. on Fujitsu this would be Fn+F6 for instance. if this doesn't work, it is possible that the touch pad has been turned off in the BIOS setup. you will have to enter the BIOS and enable or automate the "internal pointing device"

sounds like the laptop has a fault with the hardware regarding the keyboard. hand it in to your local pc repair shop and they will be able to give you a repair price

as a quick work around you can plug in a normal ps2 (pc desktop) keyboard this will temp fix your problem.

hope this helps !