Hello Any help would be appreciated. I've slimmed down Vista Ultimate to make it faster. Unfortunately, as this aim was achieved, Vista cannot go to hibernation any more. UnvLite'ed installation was OK. Now the screen fades out for 2 seconds and the word "Hibernating" can be seen, then it immediately returns me to desktop. Just no errors - nothing. Sleep does work, however. I haven't configured what can cause this. If anybody has a clue, please comment. My preset is attached here. Last_Session.ini