I'd try removing everything that's connected to your usb ports, except keyboard and mouse, and see if the PC boots normally. If you no longer get this problem then it might be that the PSU is beginning to fail.
Hands-on: Samsung Galaxy S8 review
1995-2015: How technology has changed the world in 20 years
Samsung's beautifully designed Galaxy S8 makes for better VR experiences too
47 iPhone camera tips to help you take better photos
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.