you can access your bios by pressing the delete key as soon as you restart your computer and it starts booting up - sometimes it is the F10 key...try few different ones, but those are the ones most common - once you are in bios, look through some settings and make sure it is displaying your hard drive in the right size - if even bios doesnt recognize it as a 300 some gb hard drive, than you either have to re-flash the bios, or set up the jumpers on the hard drive (if any)