My GF's ibook is dieing. I'm 99% sure its the hard drive. It will boot up on occasion, then freeze. The hard drive makes the same noise over and over till I shut it off. Sometimes it won't start, sometimes it won't find the startup disk. Sometimes it will work fine for 2 mins then will crash. Anyway, I'm basically wondering what harddrive I can buy that will be compatible. I'm looking at newegg.com and I'm just not sure what will work. and ATA-6? serial ATA-150?? just don't want to buy the wrong thing.