I've had my macbook since september...and the last few weeks it's been acting wierd. Like today I went to itunes and all my music was gone! No where to be found on my computer. Plus a few days ago, i turned it on and everthing was reset to it's default, the desktop, dashboard, the dock---it was such a pain to go back in and re-do it all----plus it went in and deleted all my photos out of iphoto. What is going on! I've tried repairing the disk feature but it doesn't seem to help. Any suggestions......