My cousin's macbook pro had it's hard drive crash, so I popped it open for him and replaced it with an extra 120GB drive I had from my A1150 macbook pro. The 120GB drive did not have an operating system on it, so when I booted it up I got a "blinking folder with a question mark". I tried to boot off of a OSX cd, but it didn't work. He told me he had recently been having problems with the DVD drive reading discs before the hard drive crashed, so I ordered a UJ-857-C super drive to replace it. I have that drive in place now and I am still unable to boot from a Snow Leopard DVD. I am also not able to eject the DVD as I was able to do with the old "bad" drive. The DVD drive audibly spins up, but I still get the same "blinking folder with a question mark". I've tried booting with the mouse button pressed, booting and the pressing command-option-o-f, and neither of these have any effect. Any ideas? I'm lost...