Serial ports will make you pull your hair out for sure...

Lets start with figuring out what your box thinks it sees...
Please post the output of:

   - lsusb
   - dmesg 
   - syslog for the period after a clean powerdown/powerup until you see a 
   login

Also give us some details about:

   - your precise hardware config - what computer make+model etc.
   - which os+version you're running

Also check 
out https://www.cyberciti.biz/faq/find-out-linux-serial-ports-with-setserial/ 
for some other stuff to perhaps try.

Does the new box have serial ports ?  It might be worth thinking about a 
serial2usb adaptor as an alternate mechanism for hooking things up. 
Sometimes the few bucks for one is less than the value of your time and 
stress battling things....

But if you have time, give us the details above so we can get more eyes on 
the problem...

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