Here's the situation. User tried to run software update to install the recent 10.4.11 OS X software update.
The update failed, and according to the user, he was shown a dialog box that said that the update failed and that the update was in the trash. The instructions said to remove the item from the trash and then run the update again.
So the user pulled the update from the trash to the desktop and executed it. When he saw that it appeared to be downloading again, he cancelled the update.
Then he tried to run software update again, but it wouldn't run. So he tried to reboot the machine (properly), only after the shutdown, the machine would only go to the gray screen with the apple and the spinning circle. After that, nothing.
There was a data CD in the media drive which I ejected by holding down the touchpad key, but still no joy.
I then inserted the 10.4.6 Boot DVD, and tried restarting while holding the C key, but the machine will not boot from the CD/DVD either. However, when I connect a bootable firewire drive (made from another machine) and boot from that (also by holding C during power-up), I am able to boot the machine. And it does seem to see the internal hard drive.
I even tried the NVRAM reset to see if it made a difference, but nothing changed.
Oh -- the hardware is a 17" Powerbook, Core2 Duo.
How can I fix this machine so that the internal hard drive is usuable again?
Any suggestions will be appreciated. Thanks.