Making the assumption you have nothing inserted in the PC/IF Port......cloning cable, headphones, aux speaker (it does happen)
Have you tryed both of the below options?
RESETTING THE SCANNER
1. Turn off the scanner, then turn it on again.
2. Insert a pointed object, such as a straightened paper clip, into the reset opening on the side of the scanner. Then gently press and release the reset button inside the opening. Pressing the reset button does not clear the scanner's memory.
INITIALIZING THE SCANNER
1. Turn off the scanner, then turn it on again. Welcome To Dual Trunking appears.
2. Press 0 then 1 while Welcome To Dual Trunking appears.
Initializing Please Wait. appears for about 2 seconds. Do not turn off the scanner until
the initialization is complete.When the initialization is complete M000 appears on the top line of the display. Bank 0 Ch 00 appears on the bottom line.
- This will wipe out your programmed info-