[Elecraft] Computer Control of K2

[NG3V]

Good Evening Group,
 
Here's an odd one.  I decided to rebuild my ham desk and upgrade my
computer.  I wound up putting the old computer back where it was, so nothing
was changed there. 
 
After all was done, I hooked everything back up, and - while the K2, KPA100
and KAT100 work fine - HRD will not recognize the radio.
 
I have checked the cables, tried both native serial ports on the mb and 2
ports on a PCI card - even reinstalled all the drivers.
 
I have tried other control programs - no joy.
 
I have opened the K2 and checked everything visually and checked for
evidence of smoke leakage.
 
I am at a loss, so I pose you two questions:
 
1.  Can anyone think of something I should look at?
 
2.  Can I use a USB to Serial dongle to hook up the K2 just to try something
else?
 
Thanks,
 
73,
 
Tom