About 2 days ago my MacBook pro(about 4 months old) went from working perfectly, to not being able to run iTunes or address book... It's running snow leopard, all software and music was bought legally. I've checked the activity monitor, nothing seemed unusual, and I've tried booting up in safemode, but still, nothing works. Anyone have ideas on how to fix this? I would re-install the discs that came with it, but they're back home(2500 miles away) and won't be back until Wednesday, any suggestions would be greatly appreciated!