I have a very big problem. Last night I was using my powerbook g4 12" and it went off all of a sudden. I thought it was on sleep, but I couldnt wake it up. I did the force power off thing,by pressing the power button till it went off. I restarted and I got this flashing folder with a question mark. as well as a finder icon. + my optical drive died some time back so i cant even run the mac os x dvd. Did my hard disk crash? Can I fix it? please help me out. i got my dissertationand all my hard to find music on it.