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The laptop owner (a very expert user) told the Restarter the harddrive needed "debugging" - led to blind-alley.

• Ran a harddrive diagnostic tool (ok)
• Mounted the drive (ok).
• Inspected system log (ok).
• Booted on Linux and noticed there was rubbish coming up on screen at boot - suspected a keyboard or touchpad fault - isolated the keyboard fault.

(Contribution by Ten.)