The screen is frozen on the screen saver piz and the laptop will not respond to any key commands or even the start button. I can't get it to shut down! I inserted a DVD just to see if that would kick it into gear, but no such luck Help!
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Boot it into single-user mode holding down Command(Apple) and S buttons when powering up. Then in terminal console, use chkdsk -fy. Use it and use it again until comes back with something like "Volume appears to be OK". Then use command: mount -uw / and then type reboot and try booting normally.
you should never shut it off with the power button unless it is not responding. When you turn the computer on, hold down the option key, and select Macintosh Hard Drive when it gives you a picture of a hard drive.
I suggest you plug it into AC power, then boot with Command-P-R held down until you hear the unit chime twice, then release it. Hopefully, it will boot after this.
If not, boot with Command-O-F held down; when you reach the command line, type
If it doesn't boot after that, you have deeper issues if the machine is actually turning itself on and off.
Well, if you erase the wrong files, you'll sure get a kernel panic.
To power down your PowerBook when there is a kernel panic on the screen (or any frozen state) you have to hold the power button for 10-15 seconds until the Mac shuts off. Then you can restart it.
If you deleted too many of the wrong files, it may not restart to your satisfaction. :-(