I'd like to change an expression '...computer was absolutely "dead"...'to a '...clinically "dead"...'
because I was able to recover it.
The problem was related to a video driver for a NVIDIA card however in my case it
wasn't a'BSOD' ( Blue Screen of Death ). It was a 'Black Screen of Death' with
a message 'Out of Range' ( at some pointduring a startup of OS).