Something could be broken. Something could be not hooked up properly. Who knows? You didn't tell us anything about your computer, so it's hard to give you any useful advice outside of looking at the sticky in the Forums for No POST.
Something could be broken. Something could be not hooked up properly. Who knows? You didn't tell us anything about your computer, so it's hard to give you any useful advice outside of looking at the sticky in the Forums for No POST.