Hello Forum,
Right.
Silly but, try other USB sockets....maybe....?
Do you know that the existing "USB device and it's Os" work on any other hardware (as required?)
Has it worked before? (yes/no).......what differences have occurred since?
It may be some incompatibility. of the image'd pen drive, aggregated to your bios .....certain settings or hardware bios kernel requirements.
(secure boot?) ....
You could re-make the Pen/thumb drive . Maybe try that for certainty.
Hope you can somehow get your "point of purpose" done.
Thx
C