Here's a forum that mentions the same problem and solution.
http://www.tenforums.com/general-discussion/13635-pc-turning-itself-after-windows-10-upgrade.html
My computer is possessed after downloading windows 10 every-time i turn off the PC or put it too sleep it turns on again within 10-15 minutes any solutions?
My friend had the same problem. We performed an exorcism. You'll need salt and holy water.