While unplugged watching a video online, the computer will turn itself off in about 16 minutes and still have 96% battery life left. Screen saver is off. slideshow screen saver is off. In the power settings both screen and sleep are all set to never. Hard drive activity is set to 1200 minutes. automatic update check is from midnight to 4am. I tried it at 5pm. pc is a ASUS ROG G751JL Which came with windows 8.1 with a microsoft update to windows 10 and all current updates. did a dskchk/f ,