What is the BIOS version and operating system you are using?
What is the boot drive’s brand and model? Are you booting from a RAID volume?Is it connected to the blue, gray, or black SATA ports?
Did you run any test on the boot drive?
It looks like the bios updates since the one I had installed (60) had at some point fixed this though I only see something similar to it in the patch notes about the blank screen and not booting at all. Thanks for your suggestion. My own mistake!