I am in desperate need of help..My husband is leaving for Afghanistan in a week, and my MacBook just decided to quit..this is our sole way of communication when he is gone.. For the last couple weeks it seems I've been getting the pinwheel a lot. I thought it was more when I tried to open IPhoto. Today it did it again and froze, and when I shut down via the button, when I tried to restart it won't go past the grey beginning screen. I've only had it a year, probably just past warranty. I searched this forum, I tried troubleshooting via the posts. I tried the safe boot, got the error "invalid node structure" over and over until I shut it down again. I then tried the disc test, and it froze after 53 minutes of testing. The first test showed pass, but didn't get beyond that.. I'm at a loss..can't afford to take it in to somebody, and my husband will be leaving.. I know, blah blah blah..if anybody can help me I would be FOREVER grateful, and so would my family..