Upon Disassembly and disconnecting the internal battery while booting to USB, it was found that the owner's hard drive is toast.
Replace the hard drive (but then you will also need an operating system.); this can get costly (Best Buy will probably have a replacement drive for $70+/- added to an os install (68.00)
or
Since you have an ssd drive, presently being used in the capacity of a pseudo-key to the hard drive (outrageous), I can turn that "feature" off in bios and install an os on the ssd (this would save you the cost of a replacement hard drive but will limit the amount of available storage space due to the ssd having less capacity.
As a glimmer of hope, in the video you see me using a utility to boot to. Whereas the owner's os refuses to boot, the computer may still start using the owner's existing damaged hard drive!
It is not uncommon for a defective drive to boot randomly and apparently without cause. This is partly due to the fact that all hardware from its manufactured date is in the pre-fail state. The degree in which a component may be in the "pre-fail" stage dictates the degree of ill-effects that a computer may exhibit.