Last night I went to bed leaving my macbook downloading a large file overnight. I come back this morning and my computer was frozen on the password screen. Force shut down and now when I restart it won't move off the light blue screen that first appears when you start up. After a while the Apple logo will come and the little spinning wheel appears as well. For a while a bar came up down the bottom, as if it was installing an update, but i just checked and it's now gone. I have no idea what to do. I've restarted it with the snow leopard disk in (although this ISN'T the disk it came with - i seem to have misplaced it) and absolutely no response. Also tried restarting in safe mode and no response. My biggest issue is that i'm leaving tomorrow for a 6 month trip where I need to take my macbook. I don't have time to take it to the apple store or send it in for repairs. Any suggestions?