So Im having my first ever problem with a Mac, bummer! I have tried Googling an answer, but didn't find anything specific enough for my situation. Last night I installed the SL Graphics Update, hoping to be able to run Starcraft 2 on a higher setting. Anyways, I installed it, and now the computer wont boot. It is stuck on the gray screen with the spinning symbol. It appears to be installing the software update, since it shows a gray progress bar, but then once that finishes, it just stays on the gray screen with the spinning symbol and goes nowhere after that. I have a Macbook Pro available to use, if I need to target the disk. Not sure how to do that though, just found that idea in my google search. I have no problem just being able to grab my important data off of it, and starting on a fresh install. I just dont want to lose my huge library of pictures and music. Thanks All!