Hi, I have a mid 2010 13 inch macbook pro, that I bought broken off of eBay in hope of fixing it and giving it to my little brother to do school work on. Since I got it so cheap, I figured out it was worth the time and hassle to fix. All the hardware appears to be working, except that the actual operating system doesn't boot up! I figured this was a software problem. I have tried multiple hard drives and the same thing happens. I have even tried resetting the PRAM and to no avail. What I want to know, is which Firmware Restoration CD do I have to download for it to restore the firmware on this particular machine? To clarify the issue I am having, when the Mac boots up to the grey Apple logo, the little gear spins for about 5-10 seconds, then freezes and it won't boot up. Thanks and your help will be greatly appreciated!