Hey guys, just got home from school and turned on my laptop to check my email, to my surprise after about 15 minutes of use it shut off with no prompts or warnings (sudden shutdown, no blue screen, no Windows shutdown process) and now it will not boot into Windows at all. After about 60 seconds on the 'Starting Windows' screen it will blue screen for a fraction of a second, then return to the Windows Boot Manager. The Windows Recovery won't start either. This computer is set up to dual boot Windows 7 and Ubuntu Linux, the later of the two is what i'm using to type this right now, there's no problem with Linux, which makes me think it isn't hardware related, although it could be. I also doubt the fact that it would be a virus as I regularly use Malwarebytes and Avast, not to mention knowing my way around the internet well enough to generally be safe. Does anyone know what could be causing this? I'm at a loss after trying to fix it for about the last hour.