The system is in a reboot loop with the message " attempting to recover installation" and then "Restoring Previous Version of Windows".
The system can be shut down by holding the shutdown button for 10+ seconds. On power up it continues the reboot loop. I can access the bios, however, changing to default setting doesn't make a difference. Built in diagnostics everything is OK. There does not appear to be a quick and dirty way to force a boot of a thumb drive or CD.
Updated the BIOS and all currents updates before the Windows Anniversary install.