I do not have Windows 8, but the links I posted above say it always hibernates to speed boot. Someone recently did post that the settings to turn that off are buried really deep in the menus.
What video chip/card do you have. It may have updated drivers and not be correct. Or if you have dual video, or Optimus you need special drivers.
Can you boot from the recovery mode? The is the second entry or may be in the sub-menu?