So recently my computer was getting bogged down with programs and files so I backed up my files and reinstalled the operating system. At the time I was running Windows 7 but since I had recently purchased Windows 8.1 I decided to use that instead. After installing the operating system I went online to download the necessary drivers and software because they had not been installed with the operating system. However I have had a problem shutting down, restarting, and sleeping my computer. Whenever I try to shut it down it goes through the standard process of shutting down but after the screen goes black the power light does not turn off and it remains in kind of a sleep mode until I hold down the power button to turn it off. The same thing happens when I restart. When I hit restart it goes through the standard way of restarting then the screen goes black but the power light never goes off and it is frozen and never reboots until I hold down the power button to turn it off. A similar thing happens when I leave the computer running for a little while. It will go into sleep mode of sorts but the power light doesn't blink like it normally does when in sleep mode. It is impossible to get out of this mode besides holding down the power button to shut it down like I mentioned previously. I believe this has something to do with the power drivers for my computer although I don't understand how because I installed the proper Lenovo Energy Management Software shortly after installing my new Operating System. I have turned off Fast Startup from the power options and gone into device manager to see if any devices were not functioning but everything appears to be running normally within the operating system. I would appreciate if you could provide any insight into this dilemma. If you need any logs or extra information please let me know. I am running a Lenovo Essentials B575 with Windows 8.1 Pro and an AMD Graphics Card.