Why are Volume Keys disabled Apple Wireless Keyboard?

Quite difficult to reproduce is the following behaviour:

if I press the Vol+,Vol- or Muite buttons (located above the numeric keypad), OSx displays the correct overlay window (just like the eject or brigthness adjust windiows), but below the volume bar, I see the disabled/not allowed icon.

Thus, these keys seem to work (at least they generate an event processed by OSx), but I didn't find any way to get them enabled again.

What works fine is the standard menu-sound-control or system settings/audio.

Additional information:
- Appearance:
just a few days ago, unfortunately I don't remember any different behaviour from my side. It happend also some time ago, but I'm not sure how I got it fixed.
- Sound setups
  - Internal soundcard
  - USB headset (mike / speakers), but no change if this is pugged in or not

I don't expect a first hit on this, but would be more than happy to have some advice to dig into this further.

Many thanx in advance,
Volker
LVL 1
vzkbAsked:
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pheidiusConnect With a Mentor Commented:
Well next reset nvram/pram. After that, try rebuilding the whole OS with disk Warior 4.
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pheidiusCommented:
Well, a first hit  try might be to repair permissions then reset  the smc.
 http://docs.info.apple.com/article.html?artnum=303319
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vzkbAuthor Commented:
Dear pheidus,

unfortunately, your suggestion didn't work.

Any other ideas?

Kind regards,
Volker
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vzkbAuthor Commented:
HI Pheidus,

thanx for listening, the reset of PRAM finally helped!

Kind regards,
Volker
NOTE: B comment, because I'm still curious what happened (we just cured the cause:-)
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strungCommented:
In System Preferences/Keyboard & Mouse/Keyboard, check the box which allows the F1, F2, etc. keys as standard function keys
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