snow cakes

Jun 1, 2009
This is driving me crazy, 3 weeks ago i did a fresh install of vista ultimate on my harddrive, everything has been fine, out of no where today i got home from work, booted up and right after It shows the INtel motherboard screen, it like flurrys like its gunna boot then goes to a black screen with a White Underscore blinking on the top left corner. I've tried everything i can think of any help with this please?