Sony VaioPCG-6J1M win't shutdown / restarts

Machine has just been restored

I appreciate you are trying to help, but it would help if you read my original post.

The Sony recovery utility (mostly likely a PowerQuest rebrand) has been run, this restores the laptop to factory fresh condition.
 
That machine had my heart broken.

But I solved the puzzle in the end.

It was a BIOS problem.

The blurb around the BIOS readme seemed irrelevant, but it was the only avenue I hadn't explored. After applying the BIOS update, a shutdown was requested, and so the machine went down, and it didn't come back up!

Voila!
 
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