EDIT: I just read rckydenver's info in the post below this one, and that sounds very promising.
(Prior to reading that post, I wrote the following):
I just tried mine, and after holding the DLY/key button, the icon comes on, but does not flash. It remains steady. I can then turn it off by holding the DLY/key button.
Hmmm.. maybe if you pull the battery out and put it back in, something will reset -- ???
If you are desperate, I believe you can reset the scanner (and lose the memory settings!!) by the following:
1. Turn off the scanner
2. Hold down the following keys simultaneously: MAN, 2, 9
3. While holding down those three keys, turn on the scanner.
Again, BEWARE -- this will lose your memory settings, I think