Good evening, Wow...what a wonderful time to start having problems with my Mac. I'm moving for college in the morning and I'm worried that my PowerBook is toast!! So I was just there, using my computer, doing nothing out-of-the-ordinary. I decided to open up a program (Yahoo! Instant Messenger, I think it was) and the computer went nuts. I completely froze...nothing I tried worked. So I shut the computer down and tried rebooting it. It chimed and went to the white start-up screen with the apple...I let it sit for about ten minutes to let it restart. Still the white screen. I shut it down and tried it again. Same thing. Is my computer dead? What might I be able to do to fix it? How much might it cost? I really hope I won't have to buy a new computer. Thank you so much in advance for any advice you might be able to offer.