The "all channels locked out" message can happen for one of a few reasons. It happens when all memory is ERASED. What you should do is press MANUAL, enter 0 0 0 and press MANUAL again. Is there anything programmed? As you press MAN (or UP) to go through the channels, is there anything programmed? If so, are these channels LOCKED OUT?
The reason you get the message is because you have the scanner in SCAN mode AND one or more of the following:
1) No banks selected
2) No frequencies programmed into the bank(s) which are selected
3) All of the programmed frequencies in the selected bank(s) are locked out.
Or as I wrote, everything has been erased. In that case, redownload your frequencies.