Klo di Vista gak muncul menu Hibernate bisa dicoba langkah berikut

Plan A
Start Orb
Start Search: powercfg.cpl
(As you type remember the .cpl)

Plan B
Start Orb
Control Panel
Mobile PC
Power OptionsVista: Click the Battery in the Navigation Area

Plan C
Launch cmd, seek 'Run as Administrator'
At the command prompt try these switches
powercfg -q (Query settings)
powercfg -h on

Plan D (Only if you have battery!)
Click the Battery in the Navigation Area,
Select Windows Mobility Center
See screenshot opposite

Plan X (For Laptops only)
Press the Windows Key +x.
Cycle through the Windows Mobility Center