I was listening on 40 meters on my 6500 this afternoon and all of a sudden I got a horrible screeching noise through my speakers. The panadapter was frozen and then I got a message that the radio had lost connection. I have powered the radio off (turning off the power supply to the radio) and waited a few minutes and when I turn it back on it stays on the calibrating screen for a long time and then the power button blinks red and the display says "timeout". Not sure what to do at this point. How do you do a reset?