My powerbook started locking up running programs last night and this afternoon froze completely. I turned it off and turned it back on a little after. It stayed at the screen and failed to boot past this. The hard drive was being accessed for about 20 minutes until everything stopped altogether. I rebooted again to find it stall on the first grey screen. I cannot eject the disc inside to try to format the drive and basically can't do anything. I'm new to macs so I'm not sure if there is something I can do here. Luckily I set aside money for a MBP..