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Hi , I would like to help.
what keyboard do you have?
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does your keyboard have volume controls , printed on the F keys? If so your defaults may be changed , and you want to return to the defaults .
Open Apple menu , System preferences . keyboard control panel .
un-tick / turn off , the option use F1 F2 etc as standard function keys.
then press the keyboard shortcut tab .
from here you can restore defaults shortcuts .
Hello - I have already tried this - I tried to say so but my descriptive powers may not be that good
Then go , system preferences , language and text control panel , input sources tab .
and make sure your language is set for the keyboard , untick any language you do not use .
correctly selected as English
Ok , what keyboard do you have?
It is the Macbook pro built in keyboard
Can you tell if the key physically works. ?
I am an old man and not v. technical! The key will depress and return alright bu nothing happens.
please try setting the key for use with spaces , or check options do not clash in these control panels . Does the key have any affect as it is . ? Please check clashing keyboard shortcuts in both Expose and spaces tabs under the expose and spaces control panel.
If it is not set for use in expose or spaces , please set the key for use with expose and test . you can select F5 etc in the choices for all windows ect in expose .
Does they key work?
I'm v sorry but I am not familiar with these processes. Will it be ok if I reply o your question a bit later.
setting the key for use in Expose should prove if the key is working correctly .
Just open , Apple menu system preferences .
Then the expose and spaces control panel .
expose tab .
then set your Fkey to the "all windows" option .
ok I,m there
it may already be set to f3 . just change it to your non working key . and test .
you can swap that back once you have tested it works ok .
If you dont have the volume control in your menu bar as yet , you can turn it on , via the sound control panel . turn on show volume in menu bar .
a volume control is now presented in the menu bar . top screen right hand side. .
I 'm sorry but these are not things i have any experience of. I'll have to come back to youlater when i'm morefamiliar with the issue
do you have any drivers for mouse installed such as USB Overdrive
USB Overdrive can affect the use of keys on the Mac .
Tip: To see if USB Overdrive is installed on your computer:
If you have this issue, update to a later version of USB Overdrive (http://www.usboverdrive.com/).
if not disregard .
You may have to find the F key setup , there may be a key that is classing with your volume control F key setting .
here is a guide for changing the keyboard shortcuts .
you can also try fn (Function key) , hold the fn (Function key) and hit F5 .
If this does not work please set the setting as before but :-
tick / turn on , the option use F1 F2 etc as standard function keys.
then hold the fn (Function key) and hit F5 .
try either way F5 or hold hold the fn (Function key) and hit F5 .
Does this help?
you can also try Shift and Option along with the volume key for finer volume control . normally this should work .
If there is still an issue , we may have to reset the Pram .
Please try resetting the SMC and Pram in turn if required it should reset the Mac hardware and then fix the issue.-Try this guide by following these steps :-Reset the SMCTo reset the SMC on a Mac Book Pro ,1 Turn off the computer and disconnect the power.2 Remove the battery and then hold down on the power button for 5 seconds.3 Reinstall the battery and turn the computer back on.Test .Pram reset if needed ..extra info :-Contents of PRAM battery backed memory is similar to a PC's bios chip.Some Macintosh computers may not have all the settings described below.Settings Stored in PRAM :-Status of AppleTalkSerial Port Configuration and Port definitionAlarm clock settingApplication fontSerial printer locationAutokey rateAutokey delaySpeaker volumeAttention (beep) soundDouble-click timeCaret blink time (insertion point rate)Mouse scaling (mouse speed)Startup diskMenu blink countMonitor depth32-bit addressingVirtual memoryRAM diskDisk cachehttp://support.apple.com/kb/HT1379?viewlocale=en_USResetting PRAM and NVRAMShut down the computer.Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously on power on.Turn on the computer.Press and hold the Command-Option-P-R keys.You must press this key combination before the gray screen appears.You must use the build in keyboard or a usb keyboard for imacs and Mac pros or if a laptop keyboard is not working correctly etc.Hold the keys down until the computer restarts and you hear the startup sound for the second time.Release the keys.Your computer's PRAM and the NVRAM are reset to the default values.The clock settings may be reset to a default date on some models.Set the clock using the internet via the Time and date preferences , Apple menu , System preferences , Time and date control panel .If the Time and date is not held in the Mac correctly it will lose time once powered down and no AC or battery is attached for more than 20mins .If so the internal battery may have to be changed for new .Let hope this fixes the Mac , please let me know if this helps .Thanks .
Hello - tried all your suggestions. No evidence that F5 button works at all. Does this mean a hardware fault with the button?