HL2 squealing when I press the foot pedal to talk.

[TJ Dowling]

Q: I have had the HL2 running Thetis software for 10 months.  One day I turned it on and hit the pedal to key the mic and I heard a squeal. I took my foot off the pedal and tried again, same thing.  Left it alone for about 10 days as I was traveling, when I got back, same thing.  I then backup the Thetis software (my profiles) and re-installed from scratch.  The squealing is gone, but when I hit the foot pedal or disconnect it and hit the Mox button, I don't see any power coming from the Daiwa CN-901 meter on the 20 watt scale and the HL2 set for 5 watts.  Same thing happens when I power up the external amp.  The CN-901 doesn't move.

I did not over drive the amp I have as it is set up for my 5 watts max.

Any thoughts on what is going on.  Thanks in advance... TJ