To Enable Hibernation, follow these steps: Click Start, and then type cmd in the Start Search box. In the search results list, right-click Command Prompt, and then click Run as Administrator. When you are prompted by User Account Control, click Continue. At the command prompt, type powercfg.exe /hibernate on, and then press ENTER. Type exit and then press ENTER to close the Command Prompt window. Share this:
Source: Enable / Disable Hibernation and Sleep in Windows Server 2008 R2 | Raffye Memon’s Blog