Hi, recently I have had a really loud buzzing noise coming from one of the fans in my computer, I fixed this problem but now when I try to turn on my computer there is a blinking cursor in the top left of my screen, I am able to get into my bios but I can't see anywhere to boot in safe mode, I also can select which hard drive to boot off (there is only one anyway) but that doesn't help either please help. Thank you