Well, today I noticed several problems with my 20" iMac's display. 4 stuck pixels, 1 dead pixel, burn in at the top, and seriously uneven blacklighting. I am hoping that I can get a replacement from Apple, but if I do, will they replace my whole computer or just the LCD? I'm assuming just the LCD, but just to be safe I want to back up my data when I send it in, so can someone give me a step by step way of backing up all of my stuff? Sorry, I'm kind of a noob at this sort of thing.