I have a very strange problem with my HP Pavilion dv7. The problem started out with a black screen coming up saying no boot device found and the hard drive was making a loud noise. I replace the hard drive and now the noise is gone but a new problem was discover. Sometimes during shut down instead of it shutting down completely it will go to that black screen saying no boot device found. Also to when pulling out the power cord I get a white screen. I tried plugging in a external monitor by vga while having the white screen and the external monitor displayed fine. When I unplug the monitor and plug the power cord back in sometimes the screen came back up find and other times after unplugging the monitor and plugging the power cord in the system crashed and either says no boot device found or brings up the diagnostics screen where you can do a system restore for windows to boot up again. Sometimes I don't have any trouble shutting down the computer and I am wondering if it only does it when it gets hot. Just about every time when I unplug the power I get the white screen. Any help resolving this problem or some good advice would be appreciated. I hope I posted this in the right section. I don't think its a software issue. I posted this somewhere else and I think it got place in the wrong place on the forum. Couldn't figure out how to delete the old post.