Hi, I'm having a problem hibernating; I can't do so at all. Holding down the shift button at the shut down screen does not provoke a response, the Standby button does not change. Pressing 'H' for the hotkey results in an error sound. Accessing hibernate from the Task Manager is not possible as well, it appears greyed out and unclickable when listed with the other options under the Shut Down tab. I have recently used services.msc to stop some services in order to improve my computer speed, and I think its likely that this caused the problem. I have made sure that Fast User Switching is enabled. Thank you for taking the time to read my post and I hope you can help!