Help needed!: OS shuts down, machine still runs

Hi, I´ve got a problem with my PC- When I want to turn it off, the OS shuts down itself, but the machine keeps running until I shut it down with hard reset. Even the monitor is recieving signal, but the screen is shining black. This problem started to occur, after I installed Elementary OS and updated to the latest kernel and did some fixes in grub. This happens with my Win 7 installation too. If any other info is missing, I´m sorry and feel free to ask me. I really appreciate all the help. Thank you.

HW Specs: Intel core i5- 3570K
Sapphire AMD HD 7950 3 GB
Intel 530 120GB SSD (For OSs)
Corsair 16GB KIT DDR3 1600MHz CL9 Black Vengeance
Gigabyte GA-Z77x-UD3h
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More about needed shuts machine runs
  1. Can you confirm this happens if you
    "sudo poweroff"
  2. So after few restarts, the problem fixed, ... Well, but still I have no idea what caused it.
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Elementary OS Shutdown Operating Systems Windows 7