Good suggestions from all.I would do as Rik lastly suggested for proof of hard drive health.Also just a thought.Check closer to the Post and see if the parameters are correct ie the correct cpu clock.If someone overclocked it sometimes you will get windows checking the hardware configuration and no boot.In that case you can clear the cmos by moving the jumper setting off then back on the contacts(located on the motherboard).You will need the manual for the exact location of the jumper.Then just reset to the proper front side bus and cpu clock and other settings.