Without knowing exactly what you have in this computer i would suggest running the computer with only the bare essentials. Dont connect the CD/DVD ROM, extra video, sound, or any other accessories. Also assure that there are no USB accessories connected to the computer. I would also suggest starting over, and going slow. Make sure all of your connectors are seated properly and everything is plugged in where it is supposed to be plugged in. Also assure that your HDD is set as Master with no slave present. Those jumpers will get ya. Hope this helps.