THANK YOU THANK YOU THANK YOU for this article. I used to take my A35-S159 in for repair when this happened since it was under warranty. But now that I would have to pay for the work myself, I figured I needed to learn how to do this myself. I can take desktop computers apart and put back together in my sleep but this is the first laptop I've owned. Like some of the others who responded to this, I dropped screws inside the laptop and got a blank screen when I turned the computer back on. But it's working now, and it's great. I thought I was doing something wrong when reassembling but then I found this article that indicated that the cpu won't go back in with any resistance. I spent over an hour trying to get it back in thinking it was supposed to resist. So again, thank you. This article saved me a whole lot of time and frustration.