My Powerbook froze, so I rebooted and now it fails to boot into OS X or at all for that matter. I hear the chime and see a gray screen and it just sits. Help! I have had so many problems with this powerbook, it boggles my mind. The hard drive has been replaced, the logic board has been replaced... I just dont understand. I thought macs were supposed to be reliable/not crash! I can't boot into single user mode or target disk mode. I just don't get it. I won't have access to Install discs until Friday, and even then I don't think it would even boot from a CD. Any ideas? Please? I'm desparate and frustrated and out of warranty. Thanks in advance.