Hi All. I have an AL-811 that I bought used from another ham. It worked fine for several months. Now when I fir it up the HV reads fine. When I switch it to Ip and apply drive, - - nothing! It doesn't recognize the drive. The red LED doesn't light and nothing on the meters. I moved and transported it in the back of my Jeep. It perhaps got a little shaken in the move. What should I check and How?? Thanks!