did u do any recent overclocking? any hardware changes?
you can try resetting the cmos by unplugging the power cables then opening up the side panel removing the battery for about 2 minutes then putting it back in, then booting up.
can u get into the bios?
if u can check if the board reads the HDD and the ram and cpu it has.
post back results
edit: do u use any USB devices printers, external HDD's?
computers are a second home