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I set up an external hard drive to boot using this videos instructions: https://www.youtube.com/watch?v=gsAzRGMimgQ

When I try to boot to the hard drive on my old computer it will start up and I will see the startup screen and it will go black as if it were about to boot, but instead to just restarts and does the same thing again and again. I tried another computer and it simply booted to a black screen. Both computers recognize my hard drive as a bootable device but both fail to boot properly. What do I do?

Doe
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  • Could you give step-by-step summary rather than a video? It makes it easier for us to see the problem faster. –  Oct 24 '16 at 22:01
  • Sure, I used a live usb flash drive and went through the steps to install ubuntu. Made a 7gb swap partition and made the rest of the drive ext4. Finished the installation and restarted. The entire disk was unallocated prior to this. – Doe Oct 24 '16 at 22:51
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    UEFI or BIOS? If UEFI http://askubuntu.com/questions/743095/how-to-prepare-a-disk-on-an-efi-based-pc-for-ubuntu You also can use gpt for BIOS booting, but then need a 1 or 2MB unformatted partition with a bios_grub flag. – oldfred Oct 24 '16 at 23:06

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Make a USB installation disk the usual way. Then connect both it and your external disk to one computer. Boot the install disk and install to the other disk.