Is this TK 790 Fried?
I should have articulated a little more about the trouble shooting that I performed. This radio is a high power trunk mount with a remote head kit. I swapped out the remote head for one that I know is working, same result. I tried all the tricks I know to get it to boot into various modes (pressing soft keys while powering on), same result. I have not tried swapping out the cable, that is something I will try next and post the results here, or I guess I could remove the remote head kit and put the control head directly on the radio to eliminate the cable as a source of trouble? Hopefully that's it (I don't know why I didn't think of that sooner).
Larry