I have a compaq presario. Im using Win 7. Ive been able to hibernate all this time. Now all of a sudden I cant hibernate. At first I thought it had to do with my battery. Since it had gone dead. I had thought it needed battery to go to hibernate and not lose its files. Then I was really disapointed when I got a new battery and it still didnt hibernate. I have to wonder if its the memory. If its because I have such low memory on my hard drive and its memory needs a certain amount of space. Ive looked up this issue online and havent seen anyone find any solution. Ive also played around with the options. I can put it into sleep but thats about it. I understand most people say who cares just put it to sleep. But Im one of those that if it has the option it should work. Plus is not the same thing. Ive also tried sleep hibernate and it wont hibernate. It does the same the same thing as in hibernate. It turns the screen off though the computer stays on. While the computer is on its on the user login option. Im sure its something trivial. I dont know how who makes pc's and we have to constantly being going around such bugs like these. I suppose thats why we have to constantly buy new ones for its actualization.