[NAME] Try turning off Fast Startup. Go to All settings / Power & sleep / click on the 'Additional power settings' link / click on 'Choose what the power buttons do' / click on  'Change settings that are currently unavailable' (if necessary) / then uncheck 'Turn on fast startup' under 'Shutdown settings'.  
Just did the latest Bios update to 1.0.23 and now when i start my XPS 8920 it just hangs on the windows startup page with the blue flag, the circle of dots do not start and after 5 minutes it shuts down. strange thing is if i hold the power button in and shut it off and then restart it it works and loads fine, but then when i shut it down and restart it again it will not start just goes to the flags and hangs, i hold the power button in and then i start it and it loads fine. only happened since the Bios update i did yesterday. Any ideas?
XPS 8920, BIOS update 1.0.23, power on issue