early 2013 MBPr 15 Won't boot

[Hookemfins]

Early 2013 MBPr 15 running 10.10 PB 6 ( hadn't had time to update).

I was in mail.app and saw the pinwheel but system was non responsive. Tried a reboot and I saw the screen below followed by a message saying to problem restarting press any key and cycle repeats. I checked the disk and no errors reported. Tried PRAM and now I still see the screen below but I hear the on sound and cycle repeats.

I am still not ruling out HD failure as my Mac Mini showed no errors in DU but still was defective and needed to be replaced.

Failed HD or other issue?

 

[Hookemfins]

After looking a little close at DU, my entire drive has been wiped out. HD space used is 1.24 GB. In 30 years of computer use I have never had an entire HD wiped out.

Any ideas, thoughts on how or why?