Dell :: When I Do Hibernate => Restarts

First of all i want to say i have a dell xps 1530, Vista.
Recentrly ive reinstalled vista and now i have something strange going on.

When i got to start (i dont use button) and click on hibernate, notebook save data and when he is about to shut down, it just starts all over, the data doesnt go loss, so it starts the same as i did leave it in hibernate.

The strange thing is that, when i after this try to shut down it restarts again, so the only thing left to do for me to push the button so it just manualy shuts down.

One more thing, when i start again, and i direcly try to hibernate or shut down then it does his job, everything happens as it should be.