I am having a pc with a dual boot.I have both windows 8.1 and xp.They worked fine.But from yesterday windows 8.1 wont boot.I thought it was black screen of death but no cursor is showing and even the logo is not showing up.When i click on windows 8.1 its jst showing a black screen.No logo its not loading totally.Plzz Help me and dont talk about formatting please.I have many important softwares please help me.Also i have xp working.