Ok. so i have a macbook pro, running on leopard.(i think, dont know if its leopard or snow leopard). Anyway, when i try to reinstall, i put the retail leopard disc in, pressed install mac osx, and pressed restart. Then it will just be stuck in the white screen forever! i tried pressing the option key, but it only shows Macinsosh HD and not the leopard disc. taking it back to apple store is not an option for me, the warranty expired just months ago. please help me reinstall my macbookpro.