OK, so I just go back from trying the new power cable. The computer
worked fine with the new cable. Got to the same error of unmountable
boot volume. When into the R option from CD, ran chkdsk/r, took about
an hour, and finished with no errors. Restarted the computer without
the CD, and everything's fine! So, thanks, everyone, for your input!
Only one problem remains. I guess from all of her trying to start it
with no power, the battery got very low. Now the battery light on her
laptop is blinking red. And, when I got into Control Panel | Power
Options, it says, "Battery not found." So I'm guessing the battery is
kaput. We're leaving it plugged in overnight to see if hopefully the
battery will come back to life. But I'm guessing she's going to need
a new battery.
Neil