10.8.2 sleep issue (when on power adapter)

I'm experiencing a strange issue with my MBP Early 2011 (8gb ram, 256 gb Ssd (osx), 512 gb Hdd(optibay))
When the mag safe is plugged and I close the lid or put it on sleep, it doesn't sleep but instead it tries to hibernate. When I open the lid or press a key nothing happen, exactely as it was hibernated, so I try with the power botton, it tries to wake up but the system is unable to load the cache saved entirely and it starts to bip.
The MBP sleeps correctly when on battery, everything works just fine.
The issue started yersterday evening with no apparent reason, the whole evening I was just watching video on youtube and browsing on the internet.
I already reset the PRAM, repaired disk permissions and tried to reset the SMC (not really sure I did it correctly)
Any suggestion?
Thank you!

RESOLVED    
Just deleted /Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist and rebooted
https://discussions.apple.com/message/9761318#9761318

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