My new Windows 7 install would not hibernate (which is really a nice feature, especially when hibernation is awesome fast using a SSD disk).
Anyways, after a bit of fiddling I found the solution – to enable hibernation do the following:
1. Open Command Prompt (with Administrator rights if UAC is enabled).
2. Next, type: powercfg /hibernate on
3. Close the Command Prompt .. you now (maybe!!) is able to hibernate (I was not)
… so if you can’t see the Hibernate option in Start menu then:
4. Launch Power Options from Start menu / Control panel
5. In the left pane, open the link labeled “Change when the computer sleeps” and then open the link “Change advanced power settings”.
6. Under the Advanced Sleep options, expand the Sleep tree and turn off Hybrid Sleep.
… and now in the Start menu you should see the Hibernate entry.