I ran the shutdown from Knoppix, and took out the CD and pressed enter when it instructed me to do so.
When I try to reboot, the tower powers on, but does not send the monitor any feed, nor does it make any beeps (this may be because it has no external speakers)The CPU fan spins up, but nothng else happens. Knoppix CD is out of the drive at this point. The monitor power light indicates power on, but no feed, and the sceen is blank.
The CD drive is internal.
In order to boot to the Knoppix CD, I had to select the CD from the boot options on powerup, but it's not even giving me that option at this point.
It's not my computer, and is, apparently, the second one to have been killed in this fashion in the last week.