Quote Originally Posted by utu View Post
@ otropogo

If you normally have usb appliances other than your sd card also in use,
try leaving the other(s) NOT plugged in until after boot.

If this allows you to boot, then try other usb slots for those
other appliances, if you have other slots.
Thanks for your suggestion. I tried it, but no cigar. The only USB device I had attached was a mouse. I detached it, powered up, hit the F12 key for the boot options (with the SD card holding FS_Knoppix in the internal card slot), and got a boot list that showed only the DVD burner, the Hard drive, and LAN.