My 3 year old Macbook wouldn't load the new Snow Leopard for some reason so I took it in for an appointment. First the \"Genius\" (Idiot) says I've got a bad optical drive, so he hooks it up to his genius box to install the software. After an hour, he says it wouldn't install. He then tests the drive and says it's failing and we should back it up as soon as possible just in case. So...when we get home and try to start the computer it can't find the hard drive. I put in the 10.4 discs, optical drive works fine, go to disc utility, plug in my External drive and am able to copy. Then I erase and reinstall the original OS, then copy back my data. Something this guy did killed my ability to boot up. I then ordered a new 500GB HD from Amazon and installed it, still using my \"dead\" optical drive.\n\nBeing a \"Genius\" doesn't matter if you give glib and sarcastic answers, don't take the time to understand what's happening, and really don't care to help.