Okay, so I was trying to delete the cache on my MacBook Pro because that always makes it a bit faster (it's an almost-3-year-old computer but it still runs nearly as well as the day I got it). Anyway, it was trying to delete the items but it froze up and I couldn't do anything. I couldn't delete the 'Locum' process in Activity Monitor. It was like this for a while so I just decided to do a hard shut-off. When I tried to boot back into OS X, the gray Apple symbol quickly turned into the universal "No" symbol. Thankfully I had a Windows partition so it proceeded to boot into that instead. Anyone have any suggestions on what I can do to get back into OS X (I have Snow Leopard)? Or is there no hope for retrieving the data I had on there?