Try booting with only one stick of ram, faulty ram, or placing the ram in the wrong sockets can cause problems. Also check to see that your IDE and CD rom drives are not on the same cable and both set to the same thing, I.E. Master or slave. Take both of these drives out of cable select if they are set to that. Second if your HD is a western digital and the only drive on the cable then remove the master/slave jumper from the back as WD's want no jumper when they are the only drive.
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