Looking for some help for why I can't seem to get snow leopard to reinstall. I am getting ready to sell my late 2010 15" MBP with Version 10.6.8. I have followed all the instructions for erasing the hard drive (zero out data in DU) and since then I can't get it to reinstall. I have the original install dvd. After erasing, I was able to go through the first steps of the install but it was unable to and gave me an error message and an option to reset. I hit restart and then it just comes to the grey screen with the apple and spinning circle. Can't get it past that. If I leave it for a long time (over an hour) it shuts itself off. Tried holding option+c on startup and can't get another screen. The disk is spinning and doing something. Wondering what I have done and if there's any way to fix it. Thanks.