alright here is the situation. my macbook died three months ago. Hard drive failure was the issue. There was big question mark flashing. So last week I decided to finally fix the issue and buy new hard drive and battery. My Cd/Dvd drive doesn't work. I need to install the operating system again because my hard drive died. How am I going to do this? Do I use an external Hard drive? If I downloaded the os or leopard to my external hard drive can I install it on boot up? I really need help on this because honestly I'm not sure where to start or what to do. I can not use my cd/dvd drive because its broken so no installation disk. Also If I downloaded leopard off the internet and put in on usb thumb or external do you think I can install it that way? Let me know and thanks guys.