Can't figure this one out. I've gone through all settings and check temps and after about 30-45 minutes if I'm not on my machine, I come back and the machine has shut down. I have it set to have a screen saver (windows) turn on after 15 minutes but that is it. This all started after the free windows 10 "upgrade". Any ideas out there? I ran searches and see stuff about vista and windows 7 mostly and just can't figure it out. Machine by the way will stay on for hrs if I'm working on it. Its when there is no activity this issue pops up.