Sleep doesn't work with connected power adapter under Yosemite 10.10.1

Hello everyone!
My MacBook Pro 13" (Mid 2010) doesn't go to sleep, when I close the lid or when I try to activate sleep under the Apple menu. I haven't changed nothing in the system preferences. I already tried the following:
unplugged all USB devices
plugged and unplugged external display
closed all applications (except of Finder of course)
reseted all energy saving preferences
deactivated bluetooth
checked share options (everything is deactivated)
Then I unplugged it from the power supply and after I closed the lid, it went to sleep. Then plugged in power supply again and sleep didn't work.
What could be the problem? Can someone help?

Solution: SMC and PRAM reset.

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