Try USB 2 ports using a USB 2 drive, and try different ports. Ive seen issues where I had a perfectly good drive and it wouldnt boot at all. Using a different port it installed fine. Similar issues using USB 3 drive or ports in machines only a few years old.
Try USB 2 ports using a USB 2 drive, and try different ports. Ive seen issues where I had a perfectly good drive and it wouldnt boot at all. Using a different port it installed fine. Similar issues using USB 3 drive or ports in machines only a few years old.