Volume controls on my Apple BT Keyboard do not control volume on my Mac Mini

I just updated the OS on my Mac Mini to Yosemite and everything was working fine, but earlier today the volume control buttons on my Apple BT Keyboard stopped controlling the volume on my Mac Mini. I was watching a movie just last night and the keyboard controlled the volume just fine. So the keyboard WAS working fine for a few hours after I installed Yosemite.
When I press the volume buttons I get the screen display for sound and instead of the up and down volume that I usually get when repeatedly pressing the volume button I get a zero with a line through it. The same thing happens when I press the mute/unmute button so the computer is not muted. And it's not an issue with the F key settings in preferences because the volume buttons DO get a response and display on the screen, but the volume doesn't change and, as I said, instead of the up/down scale I get the zero with a line through it.
I can change the volume using the mouse and sliding the volume slider in ITunes up or down, but that's the only way. Also, strangely, the volume icon in the Apple bar at the top of my screen is grayed out. When I click on it, the slider shows volume all the way up and it's grayed out. And if I click and drag to try and change that slider, it doesn't respond.
Basically, it appears that the keyboard is, in some ways, not compatible with the computer. I'm typing with the keyboard now, and all the other buttons work except for the volume up/down/mute buttons. Even the change track, play/pause buttons work just fine. So it's not specific to the music controls. And again, I DO get that display for volume when I press volume up/down/mute with the zero and line through it.
I've owned Macs for over 10 years and this is the first time I've seen this. Very, very strange so any help possible is appreciated.

Try booting in Safe Mode
OS X: What is Safe Boot, Safe Mode?
Next, reset the SMC and NVRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
About NVRAM and PRAM

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