I have a Macbook1,1 which currently has Windows 7 installed. The original hard drive was corrupt, so I replaced it with another from another computer (which had Windows 7 on it). I would just stick with Windows 7, but audio drivers are pretty much nonexistant for this combination. I have a white replacement OS X Tiger disk, as well as a USB Snow Leopard install. Ideally, I'd like to put snow leopard on it, but I can't actually get it to boot anything except Windows. Booting and holding C just gives me Windows boot manager. I tried using a different hard drive, formatted to HFS+, and it just went to a black screen saying "no operating system found". Holding command during bootup gave me the option to boot Windows on the first drive, and gave me a blank screen on the second drive. I think I need to upgrade the firmware, but I can't get it to boot Mac OS, and I don't know how to upgrade firmware on 7. Basically... any ideas on installing OS X, or updating the firmware (to eventually install OS X) while running Windows 7?