W540 sleep mode buttons are not working

Hello,
My question concerns the non-functioning  sleep mode buttons on my Lenovo W540 20BG.
In my current power management settings, the W540 is suppose to
enter sleep mode by pressing Fn4 or by pressing the round power button shortly.
However, either one of these methods do not work.
My computer does enter sleep mode when usign the Windows start menu 
(Start->Shut Down -> Sleep).
Please advise how to fix the sleep mode buttons.
Thank you,
Nir
Solved!
Go to Solution.

Is this Windows 7, 8, or 8.1?
Can you try running the Power Management driver installer as administrator?
@Bauden,
Removing the sleep hotkey is dumb indeed; I'd like to have control over whether or not to sleep when the lid is closed (if I'm running something overnight and don't want the screen to come on at all).
Horrible gripe with this with my new Flex 14. Sincerely hoping this change is rolled back.
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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