i bought a hard drive from here on ifixit... the seagate momentus 750 gig/ 7200, and the screws for the battery have five points, not three!?! i also had missing mounting screws that i replaced from a local apple store (luckily they has a few in back)... at any rate, i tried to install the OS (snow leopard) by booting holding down option as i powered up with the new drive (not removing the battery, since the tool kit i ordered only had torx and tri point tips)... my question is why won't the drive from ifixit show in an option button boot up, and why wont the boot from cd go any further that the opening sound and apple screen? any one else have this issue?