I am selling my macbook and i wanted to do a clean install. So i put the install disk in and said erase and install factory settings? It got as far as clearing my HDD but then its getting hung up on the disk. It says i might have scratches. I cleaned the disk and pput it back in. Still not working. The HDD is blank now and it wont boot up at all without putting thee install disk in. this macbook is white, about 4 years old. intel. WTF? FML.