Boot problems after installing LL to USB

[ranwaldo]

I have installed LinuxLite 4.2 onto a USB flash drive from a DVD containing the .iso. I tried to be very careful but something went badly wrong.

Here are the symptoms I have now:

• Booting from the HD with no USB device results in the prompt: grub rescue>
  
• Booting from the USB fails. I just see eternally a non responsive black screen with an underscore cursor at the top.
  
• Booting from the HD with a the USB device displays a menu where I can choose to boot Linux Lite or Windows 10. They both will boot successfully.
  

Any insights or suggestions will be greatly appreciated. I am thinking of getting the Boot Repair Tool and hacking with that but I am kind of in the dark here.

TIA, ~Randy