i have here a MBP @ 2.53 core duo 250 gb. i wanted to do a fresh install so i deleted everything (yes i forgot to back up ive paid the price for it already) and restarted it..it tells me select the language it tries to install then tells me "cannot install mac os x on this computer". i used a microusb in a reader to do this with snow leopard. so i read a couple of tutorials. and i made sure it was in the guid partition. i decreased the size of the drive and tried to install it (i read a forum where this worked for some) n it didnt work. i installed snow leopard on my hard drive and tried installing it from there and got the same response.i also tried it from my snow leopard disk that came with my mbp (im working on my friends.) that also didnt work. ive been on this for awhile and would appreciate any help i can get. thanks!!