I have a Mac OS X version 10.5.8, one of the 2008 black/white models. Yesterday, I was messing around with my computer because the hard drive will not show up in the finder (I already did the system preferences, doesn't work). However, I guess I must have deleted something because when I restarted my computer, the menu bar blinks in and out unless i get onto safari but I can't get into finder at all. Also, All of my items on my desk top are gone. And I can't get into Itunes (file locked, on a locked disk, or do not have written permission to enter it) I'm assuming this means I need to take it in and get it fixed. But I wanted to see if I can do anything to avoid that because I am in college and have a paper every week so I pretty much live off of my computer. Thanks guys!