Several days ago, I went to dinner and left my 2 year old Ibook on. It went to sleep of course and later, when I returned, it would not wake up so I shut it down. When I attempted to restart it, I got a blinking folder displaying a question mark. When I try to boot from the system disk, the drive spins up but I get a screen that seems to have a lot of Unix commands, kernals etc. superimposed over a dialogue box that suggests pressing the restart button. I have rebooted the PRAM, the PMU and tried to run the hardware check but the unit will not boot from the system disk (10.4.10), so I can't do anything. I have used Macs since 1984 and this has me stumped. I even tried to access the hard drive using the target disk mode with no luck. It will start and display the moving target but the drive never appears on the second computer.