Keyboard Shortcuts for "Sleep", "Restart", "Shutdown" and switching the screen off don't work any more

Hi,
I am running OX Yosemite Version 10.10.2 on an iMac 27 inches.
A couple of days ago a realized that a few keyboard shortcuts that I use a lot didn't work any more. They are:
Sleep --> cmd + alt + eject
Turn of the screen --> **** + ctrl + eject
Shutdown --> ctrl + alt + cmd + eject
Does anybody know why?
Thank you so much in advance.
Regards.

Does single-user mode work? Command-S at startup. Since that doesn't rely on anything but the keyboard, this might be a good test.
Have the other keyboard shortcuts ever worked on your computer, or did they recently cease to work?

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