Hi all I just have a XPS M1330 with Vista Ultimate. Originally hibernation works fine during the first few days. After install some of my software and data documents, the laptop is now unable to hibernate as well as sleep. I set all power settings correctly, how and when to hibernate and turn off hybersleep as well. And the option "Hibernate" do appear on the startup menu. But when I select "Hibernate" or press the power button on my laptop (set to do Hibernate) the screen black out (as in the process of hibernation) but for 1-2 seconds then the screen flicker a bit and return to the Lock screen. So in effect hibernation or sleep now only result in locking out the system. I found that if I log into command prompt (as administrator, cmd.exe) and issue 2 commands turn off then turn on hibernation (powercfg.exe -h off, and powercfg.exe -h on) then hibernation function properly. But if I restart the machine, then the problem occur again. So basicly each time the marchine is restarted I must manually turn off and turn on hibernation in cmd for hibernation to work. How to permanently turn on hibernation? My C harddrive still has 13 GB of free diskspace. Would this be the problem? Or would some of my anti-virus, anti-spyware programs conflict with the setting? Please help. Regards, Tam.