I have dual booted windows 7 with Ubuntu 14.04 on my laptop. I had used windows and hibernated when it had low battery(was done when half asleep). But I hadn't taken notice of what happened during hibernate. Later when I opened my laptop, it wouldn't open. I then charged my laptop. The dell logo came up and then the black screen with blinking cursor appeared.I can't access any of the OS, neither Ubuntu nor windows. and i desperately need to access any one of the operating systems[exams coming up]. First question: is it that my windows boot files have damaged? Second question: how do i fix it? [note]: I have tried setting hard drive as first priority in the BIOS SETTINGS but no change in the problem. I can't even access the safe mode.