When HDD is connected via a USB connection, it boots fine, but when placed in computer and connected via SATA cable, reboot doesn't complete. Drives seem to be in boot order. There are NO system files on the HDD.
HP Compaq 8200 Elite Convertible Minitower Business PC
intel core i5 2400 3.1gHz
16Gb ram (4x 4Gb DDR3)
I have tested all the SATA cables, alternated the ports and the power connections.