I bought a refurb Compaq laptop for 599$ the day after christmas. Twice now its not wanted to come out of hibernate. I press the powerbutton and nothing happens. What I have to do is pop the battery out and back in, and then it will boot up just fine. It didn't do this until after I reinstalled windows to get all that preinstalled crap off of it. Is this a software or hardware problem, and should I take advantage of the 90 day warranty?