This happens each time from the start menu. I have let it try to restart for up to 20 minutes. I get the HP logo and maybe 2 1/2 rotations of the "dots" then it freezes. I must power down with the power switch / power up and all is well. I have noticed that the restart will show my wifi indicator lamp illuminated and my volume on/off light will not illuminate during restart. Sequentially, both lamps illuminate when I power up the system. The computer is a new HP 15 which came with Windows 8.1. Not an earth shattering deal however I wish it to go away and ya'll seem to be about the only ones these days who are actually able to resolve issues.