What happens when you press the win key+ V when the computer is starting up in win 10.?

To be honest I really dont know - but this might he,p you

Windows 10 introduces the following:[

• ⊞ Win+A opens Action Center.
  • ⊞ Win+V or ⊞ Win+⇧ Shift+V cycles through notifications.
• ⊞ Win+C activates Cortana listening mode.
• ⊞ Win+G opens the Game DVR bar when a game is open.
  • ⊞ Win+Alt+R starts or stops recording. All recordings are saved in the "Captures" folder in the "Videos" library as an MP4 file.
  • ⊞ Win+Alt+G records the last 30 seconds when background recording is turned on for the game.
  • ⊞ Win+Alt+T shows or hides the recording timer.
  • ⊞ Win+Alt+PrtScr instantly saves a screenshot to the "Captures" folder in the "Videos" library. All screenshots are saved as PNG files.
• ⊞ Win+I opens Settings.
• ⊞ Win+F opens the Feedback Hub.
• ⊞ Win+Tab ↹ opens task view.
• ⊞ Win+↑+← through ⊞ Win+↓+← to align a window snapped to the right or left to the corresponding quadrant of the screen.
• ⊞ Win+Ctrl+D creates a new virtual desktop.
• ⊞ Win+Ctrl+F4 closes the active virtual desktop.
• ⊞ Win+Ctrl+← or → switches between virtual desktops.

Bios roll back is needed when the win updates are not compatable and you need to go back to go the previous  bios.