F9, F10, F11, F12 don't work after startup

Every time i reset or reboot my mac, the four functions keys are unavailable. this really frustrates me. i lose functionality and have to tick the boxes again and again.
i run os x 10.4.8., installed no widgets, but I did install (and deleted) a screensaver application. that's it. since i also installed FCP and other software and don't have an external hard disk yet, i am somewhat frightened by using the reinstall CD's; i don't want to lose any of my other software/ files. does anybody have any ideas? my gratitude would be enormous.
there's better things to do on a sunday afternoon than trying to figure out how to remove this bug...

Something may be unbinding the "F" keys. Go to SYSTEM PREFERENCES module and select KEYBOARD & MOUSE. Open KEYBOARD SHORTCUTS and verify the settings for the "F" keys in question, modify as needed.
Next thing to do if that corrects it would be to check these settings after starting an application you suspect may be doing the changes.

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I had to buy a new keyboard but F10, F11 & F12 don't work for the volume. What can I do to activate it?

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Hello,
I think Spark cured this for another person and the same problem...
http://www.shadowlab.org/Software/spark.php

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Hi rkoopman & welcome to the forums
I would start by going in to System Preferences/Keyboard and see if the option to use all F keys as standard function keys is checked, then move the the Keyboard Shortcuts tab and 'Keyboard & Text Input' to see what the F key settings are there...confirm there are no conflicts with your desired sound settings.
Next go to Sound Preferences and confirm you can raise/lower the sound settings normally there.
Finally, do you have an 3rd party programs that work to modify the Finder Menu bar or keys....any chance you're using Growl, as an example?

My screen brightness(F1,F2), Keyboard backlight(F5, F6) & volume buttons(F10, F11, F12) no longer work.

Pretty sure no major updates, installations or uninstallations have occurred since it worked last. Under the keyboard settings, the "Use all F1, F2, etc....." is uncheck which is normal. Keyboard settings have been reset to default with no luck on fixing the problem. Any help would be greatly appreciated. Thanks.

Delete the System Preferences plist per these instructions:
https://discussions.apple.com/docs/DOC-4301
If that does not solve the problem, I suggest a reinstall of the OSX.
Ciao.

Macbook OS X 10.8.2 Volume keys: F10, F11, F12 stopped working as volume keys. How to reset?

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RSVP ASAP

Dear Barney-15E,
Your answer got me on the right track. I followed the suggestions as well as I could. Finally I ended up holding down the fn key as I pressed f10, f11& f12. Each one now works as it had before something happened.
chas
Infinite Gratitude, Love, JOY, NOW!

Volume keys: F10, F11, F12 stopped working as volume keys. How to reset?

On the MacBook, 13 inch OS X Version 10.8.2, Volume keys: F10, F11, F12 stopped working as Volume keys. How do I reset them back to functio as the Volume keys?

System Preferences>Keyboard:
- this is from Snow Leopard so Mountain Lion may be slightly different but the principle should be the same. If it isn't you need to ask in the Mountain Lion forum.

My MacAir is great except for a problem i have. Keys F1, F2,F5,F6,F7,F8,F9,F10,F11,F12 and the power button are unresponsive. These are keys i frequently use and i have searched the whole apple help centre. Anyone got answers for me? Please helP!!!

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Some keys don't work as expected
From the Apple menu, choose System Preferences.
From the View menu, choose Speech.
Click the Text to Speech tab.
If "Speak selected text when the key is pressed" is enabled, the key or key combination set to speak text cannot be used for other purposes or used to type text--click Set Key and change it to a less-commonly used key combination (try to use modifier keys such as Shift, Command, Option, and Control). Or, disable the "Speak selected text when the key is pressed" option.
Click the Universal Access pane in System Preferences, click the Keyboard tab.
Make sure that Slow Keys is turned off. With Slow Keys on, you need to press a key for a longer period of time for it to be recognized.
In the Universal Access pane, click the Mouse tab, and make sure Mouse Keys is turned off. With Mouse Keys enabled, you cannot use the Numeric Keypad to enter numbers--instead the keypad moves the pointer (cursor). (There is an option to enable Mouse Keys with five presses of the Option key; you may want to turn that option off to avoid accidentally enabling it.) If Mouse Keys is enabled and you are using a keyboard with no numeric keypad or Num Lock function, see Unable to type while Mouse Keys is enabled in Mac OS X.
If the function keys on the top row of the keyboard are not working as expected, see Mac OS X: How to change the behavior of function keys.
If the issue persists, use Keyboard Viewer to help isolate the issue:
Click the Language & Text pane (Mac OS X v10.6) or International pane (Mac OS X v10.5.8 or earlier) in System Preferences.
Click the Input Sources tab (or Input Menu tab in Mac OS X 10.5.8 or earlier).
Click the Keyboard & Character Viewer "On" checkbox to select it (click the Keyboard Viewer "On" checkbox in Mac OS X 10.5.8 or earlier).
From the Input (flag) menu, choose Show Keyboard Viewer.
If the keyboard is connected and detected by Mac OS X, the keys you type will highlight in the Keyboard Viewer window. Open TextEdit (or any text application), and try to type something using the keys that were previously not responding to see if they highlight in Keyboard Viewer.
Start from the Mac OS X Install Disc, choose Terminal from the Utilities menu and test the keys which were previously not working. If the keys work while started from the Install disc, then the keyboard itself is working correctly. Use Mac OS X: How to troubleshoot a software issue to isolate the software issue that may be causing the keys to not respond.
http://support.apple.com/kb/TS1381

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This question was solved.
View Solution.

Hi Jim,
You're welcome
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DP-K
****Click the White thumb to say thanks****
****Please mark Accept As Solution if it solves your problem****
****I don't work for HP****
Microsoft MVP - Windows Experience

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Regards,
DP-K
****Click the White thumb to say thanks****
****Please mark Accept As Solution if it solves your problem****
****I don't work for HP****
Microsoft MVP - Windows Experience

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F9, F10, F11, F12 don't work after startup

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