My laptop intermitently reboots without warning. It just suddenly shuts down and reboots sometimes every 5 - 10 minutes and other times I can run for an hour before it does this. I believe it may have something to do with the fan since it makes a lot of noise at the initial boot up and then quiets down. Other times it can get noisy. I would like to replace the fan and see if this resolves the problem. Where can I find specific instructions to walk me through this? Thanks